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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.08133">arXiv:1711.08133</a> <span> [<a href="https://arxiv.org/pdf/1711.08133">pdf</a>, <a href="https://arxiv.org/ps/1711.08133">ps</a>, <a href="https://arxiv.org/format/1711.08133">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.96.184524">10.1103/PhysRevB.96.184524 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Coincidence of magnetic and valence quantum critical points in CeRhIn5 under pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Z. Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G+W">G. W. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Aoki%2C+D">D. Aoki</a>, <a href="/search/cond-mat?searchtype=author&query=Miyake%2C+K">K. Miyake</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+S">S. Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.08133v1-abstract-short" style="display: inline;"> We present accurate electrical resistivity measurements along the two principle crystallographic axes of the pressure-induced heavy-fermion superconductor CeRhIn5 up to 5.63 GPa. For both directions, a valence crossover line is identified in the p-T plane and the extrapolation of this line to zero temperature coincides with the collapse of the magnetic ordering temperature. Furthermore, it is foun… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.08133v1-abstract-full').style.display = 'inline'; document.getElementById('1711.08133v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.08133v1-abstract-full" style="display: none;"> We present accurate electrical resistivity measurements along the two principle crystallographic axes of the pressure-induced heavy-fermion superconductor CeRhIn5 up to 5.63 GPa. For both directions, a valence crossover line is identified in the p-T plane and the extrapolation of this line to zero temperature coincides with the collapse of the magnetic ordering temperature. Furthermore, it is found that the p-T phase diagram of CeRhIn5 in the valence crossover region is very similar to that of CeCu2Si2. These results point to the essential role of Ce-4f electron delocalization in both destroying magnetic order and realizing superconductivity in CeRhIn5 under pressure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.08133v1-abstract-full').style.display = 'none'; document.getElementById('1711.08133v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 6 figures, to appear in PRB</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 96, 184524 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.05145">arXiv:1711.05145</a> <span> [<a href="https://arxiv.org/pdf/1711.05145">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41535-018-0111-6">10.1038/s41535-018-0111-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Dominant Role of Critical Valence Fluctuations on High $T_{\rm c}$ Superconductivity in Heavy Fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G+W">Gernot W. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Zhi Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+S">Shinji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G茅rard Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Aoki%2C+D">Dai Aoki</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">Didier Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Miyake%2C+K">Kazumasa Miyake</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.05145v2-abstract-short" style="display: inline;"> Despite almost 40 years of research, the origin of heavy-fermion superconductivity is still strongly debated. Especially, the pressure-induced enhancement of superconductivity in CeCu$_2$Si$_2$ away from the magnetic breakdown is not sufficiently taken into consideration. As recently reported in CeCu$_2$Si$_2$ and several related compounds, optimal superconductivity occurs at the pressure of a val… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05145v2-abstract-full').style.display = 'inline'; document.getElementById('1711.05145v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.05145v2-abstract-full" style="display: none;"> Despite almost 40 years of research, the origin of heavy-fermion superconductivity is still strongly debated. Especially, the pressure-induced enhancement of superconductivity in CeCu$_2$Si$_2$ away from the magnetic breakdown is not sufficiently taken into consideration. As recently reported in CeCu$_2$Si$_2$ and several related compounds, optimal superconductivity occurs at the pressure of a valence crossover, which arises from a virtual critical end point at negative temperature $T_{\rm cr}$. In this context, we did a meticulous analysis of a vast set of top-quality high-pressure electrical resistivity data of several Ce-based heavy fermion compounds. The key novelty is the salient correlation between the superconducting transition temperature $T_{\rm c}$ and the valence instability parameter $T_{\rm cr}$, which is in line with theory of enhanced valence fluctuations. Moreover, it is found that, in the pressure region of superconductivity, electrical resistivity is governed by the valence crossover, which most often manifests in scaling behavior. We develop the new idea that the optimum superconducting $T_{\rm c}$ of a given sample is mainly controlled by the compound's $T_{\rm cr}$ and limited by non-magnetic disorder. In this regard, the present study provides compelling evidence for the crucial role of critical valence fluctuations in the formation of Cooper pairs in Ce-based heavy fermion superconductors besides the contribution of spin fluctuations near magnetic quantum critical points, and corroborates a plausible superconducting mechanism in strongly correlated electron systems in general. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05145v2-abstract-full').style.display = 'none'; document.getElementById('1711.05145v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Supplementary Material follows after the bibliography</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Materials Volume 3, Article number: 41 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.02965">arXiv:1711.02965</a> <span> [<a href="https://arxiv.org/pdf/1711.02965">pdf</a>, <a href="https://arxiv.org/ps/1711.02965">ps</a>, <a href="https://arxiv.org/format/1711.02965">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physb.2017.09.120">10.1016/j.physb.2017.09.120 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Heavy-Fermion Superconductivity in CeAg$_2$Si$_2$ --Interplay of Spin and Valence Fluctuations-- </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G+W">Gernot W. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Zhi Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G茅rard Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Garbarino%2C+G">Gaston Garbarino</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">Didier Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.02965v1-abstract-short" style="display: inline;"> We present the pressure-temperature phase diagram of the antiferromagnet CeAg$_2$Si$_2$ established via resistivity and calorimetry measurements under quasi-hydrostatic conditions up to 22.5~GPa. With increasing pressure, the N茅el temperature [$T_{\mathrm{N}}(p=0)=8.6$~K] slowly increases up to $T_{\mathrm{N}}=13.4$~K at 9.4~GPa and then vanishes abruptly at the magnetic critical pressure… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.02965v1-abstract-full').style.display = 'inline'; document.getElementById('1711.02965v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.02965v1-abstract-full" style="display: none;"> We present the pressure-temperature phase diagram of the antiferromagnet CeAg$_2$Si$_2$ established via resistivity and calorimetry measurements under quasi-hydrostatic conditions up to 22.5~GPa. With increasing pressure, the N茅el temperature [$T_{\mathrm{N}}(p=0)=8.6$~K] slowly increases up to $T_{\mathrm{N}}=13.4$~K at 9.4~GPa and then vanishes abruptly at the magnetic critical pressure $p_{\mathrm{c}}\sim13$~GPa. For the first time, heavy fermion superconductivity is observed in CeAg$_2$Si$_2$ . Superconductivity emerges at $\sim 11$~GPa and persists over roughly 10~GPa. Partial- and bulk-transition temperatures are highest at $p=16$~GPa, with a maximal $T_{\mathrm{c}^{\rm bulk}}=1.25$~K. In the pressure region of superconductivity, Kondo and crystal-field splitting energies become comparable and resistivity exhibits clear signatures of a Ce-ion valence crossover. The crossover line is located at a rapid collapse in resistivity as function of pressure and extrapolates to a valence transition critical endpoint at critical pressure and temperature of $p_{\rm cr}\sim 17$~GPa and $T_{\rm cr}\sim-13~K$, respectively. Both critical spin and valence fluctuations may build up superconductivity in CeAg$_2$Si$_2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.02965v1-abstract-full').style.display = 'none'; document.getElementById('1711.02965v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> G. W. Scheerer, Z. Ren, G. Lapertot, G. Garbarino, D. Jaccard, Physica B (2017), 10.1016/j.physb.2017.09.120 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1611.03234">arXiv:1611.03234</a> <span> [<a href="https://arxiv.org/pdf/1611.03234">pdf</a>, <a href="https://arxiv.org/ps/1611.03234">ps</a>, <a href="https://arxiv.org/format/1611.03234">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.7566/JPSJ.86.064710">10.7566/JPSJ.86.064710 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-pressure study of the ground- and superconducting-state properties of CeAu$_2$Si$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G+W">Gernot W. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Giriat%2C+G">Ga茅tan Giriat</a>, <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Zhi Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G茅rard Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">Didier Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1611.03234v2-abstract-short" style="display: inline;"> The pressure-temperature-phase diagram of the new heavy-fermion superconductor CeAu$_2$Si$_2$ is markedly different from those studied previously. Indeed, superconductivity emerges, not on the verge, but deep inside the magnetic phase. In this context, we have carried out ac-calorimetry, resistivity and thermoelectric power measurements on a CeAu$_2$Si$_2$-single crystal under high-pressure. The p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.03234v2-abstract-full').style.display = 'inline'; document.getElementById('1611.03234v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1611.03234v2-abstract-full" style="display: none;"> The pressure-temperature-phase diagram of the new heavy-fermion superconductor CeAu$_2$Si$_2$ is markedly different from those studied previously. Indeed, superconductivity emerges, not on the verge, but deep inside the magnetic phase. In this context, we have carried out ac-calorimetry, resistivity and thermoelectric power measurements on a CeAu$_2$Si$_2$-single crystal under high-pressure. The principal novelties of this experiment are the observation of a new transition line, presumably a magnetic structure rearrangement at $T_{\mathrm{M}}^{\mathrm{mod}}$ inside the antiferromagnetic phase, and the occurrence of quantum critical behavior in resistivity linked to superconductivity. Strong non-Fermi-liquid behavior is observed around the maximum of superconductivity and enhanced scattering rates are observed close to both the emergence and the maximum of superconductivity. Intriguingly, $T_{\mathrm{M}}^{\mathrm{mod}}$ almost coincides with the onset of the superconducting transition over a broad pressure range, where mysteriously Tc increases with the strengthening of magnetism. A comparison of the features in CeAu$_2$Si$_2$ and its parent compounds CeCu$_2$Si$_2$ and CeCu$_2$Ge$_2$ plotted as function of the unit-cell volume leads us to promote that critical fluctuations of a valence crossover play a crucial role in the superconducting paring mechanism. Our study reveals new intriguing features of magnetism and illustrates a complex interplay between magnetism, quantum criticality and superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.03234v2-abstract-full').style.display = 'none'; document.getElementById('1611.03234v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. Soc. Jpn., Vol.86, No.6, Article ID: 064710 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.10045">arXiv:1610.10045</a> <span> [<a href="https://arxiv.org/pdf/1610.10045">pdf</a>, <a href="https://arxiv.org/format/1610.10045">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Isotope effect in superconducting n-doped SrTiO$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stucky%2C+A">A. Stucky</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G">G. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Z. Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Poumirol%2C+J+-">J. -M. Poumirol</a>, <a href="/search/cond-mat?searchtype=author&query=Barreteau%2C+C">C. Barreteau</a>, <a href="/search/cond-mat?searchtype=author&query=Giannini%2C+E">E. Giannini</a>, <a href="/search/cond-mat?searchtype=author&query=van+der+Marel%2C+D">D. van der Marel</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1610.10045v2-abstract-short" style="display: inline;"> We report the influence on the superconducting critical temperature $T_c$ in doped SrTiO$_3$ of the substitution of the natural $^{16}$O atoms by the heavier isotope $^{18}$O. We observe that for a wide range of doping this substitution causes a strong ($\sim 50 \%$) enhancement of $T_c$. Also the magnetic critical field $H_{c2}$ is increased by a factor $\sim 2$. Such a strong impact on $T_c$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.10045v2-abstract-full').style.display = 'inline'; document.getElementById('1610.10045v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.10045v2-abstract-full" style="display: none;"> We report the influence on the superconducting critical temperature $T_c$ in doped SrTiO$_3$ of the substitution of the natural $^{16}$O atoms by the heavier isotope $^{18}$O. We observe that for a wide range of doping this substitution causes a strong ($\sim 50 \%$) enhancement of $T_c$. Also the magnetic critical field $H_{c2}$ is increased by a factor $\sim 2$. Such a strong impact on $T_c$ and $H_{c2}$, with a sign opposite to conventional superconductors, is unprecedented. The observed effect could be the consequence of strong coupling of the doped electrons to lattice vibrations (phonons), a notion which finds support in numerous optical and photo-emission studies. The unusually large size of the observed isotope effect supports a recent model for superconductivity in these materials based on strong coupling to the ferroelectric soft modes of SrTiO$_{3}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.10045v2-abstract-full').style.display = 'none'; document.getElementById('1610.10045v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1602.02498">arXiv:1602.02498</a> <span> [<a href="https://arxiv.org/pdf/1602.02498">pdf</a>, <a href="https://arxiv.org/ps/1602.02498">ps</a>, <a href="https://arxiv.org/format/1602.02498">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.94.024522">10.1103/PhysRevB.94.024522 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scaling behavior of temperature-dependent thermopower in CeAu2Si2 under pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Z. Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G+W">G. W. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G. Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1602.02498v2-abstract-short" style="display: inline;"> We report a combined study of in-plane resistivity and thermopower of the pressure-induced heavy fermion superconductor CeAu2Si2 up to 27.8 GPa. It is found that thermopower follows a scaling behavior in T/T* almost up to the magnetic critical pressure pc ~ 22 GPa. By comparing with resistivity results, we show that the magnitude and characteristic temperature dependence of thermopower in this pre… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.02498v2-abstract-full').style.display = 'inline'; document.getElementById('1602.02498v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1602.02498v2-abstract-full" style="display: none;"> We report a combined study of in-plane resistivity and thermopower of the pressure-induced heavy fermion superconductor CeAu2Si2 up to 27.8 GPa. It is found that thermopower follows a scaling behavior in T/T* almost up to the magnetic critical pressure pc ~ 22 GPa. By comparing with resistivity results, we show that the magnitude and characteristic temperature dependence of thermopower in this pressure range are governed by the Kondo coupling and crystal-field splitting, respectively. Below pc, the superconducting transition is preceded by a large negative thermopower minimum, suggesting a close relationship between the two phenomena. Furthermore, thermopower of a variety of Ce-based Kondo-lattices with different crystal structures follows the same scaling relation up to T/T* ~ 2. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.02498v2-abstract-full').style.display = 'none'; document.getElementById('1602.02498v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures. Supplementary Material available on request</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 94, 024522 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.00616">arXiv:1506.00616</a> <span> [<a href="https://arxiv.org/pdf/1506.00616">pdf</a>, <a href="https://arxiv.org/format/1506.00616">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.115.176402">10.1103/PhysRevLett.115.176402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr$_2$IrO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=de+la+Torre%2C+A">A. de la Torre</a>, <a href="/search/cond-mat?searchtype=author&query=Walker%2C+S+M">S. McKeown Walker</a>, <a href="/search/cond-mat?searchtype=author&query=Bruno%2C+F+Y">F. Y. Bruno</a>, <a href="/search/cond-mat?searchtype=author&query=Ricco%2C+S">S. Ricco</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Z. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Lezama%2C+I+G">I. Gutierrez Lezama</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G">G. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Giriat%2C+G">G. Giriat</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Berthod%2C+C">C. Berthod</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+T+K">T. K. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Hoesch%2C+M">M. Hoesch</a>, <a href="/search/cond-mat?searchtype=author&query=Hunter%2C+E+C">E. C. Hunter</a>, <a href="/search/cond-mat?searchtype=author&query=Perry%2C+R+S">R. S. Perry</a>, <a href="/search/cond-mat?searchtype=author&query=Tamai%2C+A">A. Tamai</a>, <a href="/search/cond-mat?searchtype=author&query=Baumberger%2C+F">F. Baumberger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1506.00616v1-abstract-short" style="display: inline;"> Superconductivity in underdoped cuprates emerges from an unusual electronic state characterised by nodal quasiparticles and an antinodal pseudogap. The relation between this state and superconductivity is intensely studied but remains controversial. The discrimination between competing theoretical models is hindered by a lack of electronic structure data from related doped Mott insulators. Here we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.00616v1-abstract-full').style.display = 'inline'; document.getElementById('1506.00616v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.00616v1-abstract-full" style="display: none;"> Superconductivity in underdoped cuprates emerges from an unusual electronic state characterised by nodal quasiparticles and an antinodal pseudogap. The relation between this state and superconductivity is intensely studied but remains controversial. The discrimination between competing theoretical models is hindered by a lack of electronic structure data from related doped Mott insulators. Here we report the doping evolution of the Heisenberg antiferromagnet Sr$_2$IrO$_4$, a close analogue to underdoped cuprates. We demonstrate that metallicity emerges from a rapid collapse of the Mott gap with doping, resulting in lens-like Fermi contours rather than disconnected Fermi arcs as observed in cuprates. Intriguingly though, the emerging electron liquid shows nodal quasiparticles with an antinodal pseudogap and thus bares strong similarities with underdoped cuprates. We conclude that anisotropic pseudogaps are a generic property of two-dimensional doped Mott insulators rather than a unique hallmark of cuprate high-temperature superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.00616v1-abstract-full').style.display = 'none'; document.getElementById('1506.00616v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 115, 176402 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.05172">arXiv:1501.05172</a> <span> [<a href="https://arxiv.org/pdf/1501.05172">pdf</a>, <a href="https://arxiv.org/ps/1501.05172">ps</a>, <a href="https://arxiv.org/format/1501.05172">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.91.094515">10.1103/PhysRevB.91.094515 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effect of disorder on the pressure-induced superconducting state of CeAu2Si2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Z. Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Giriat%2C+G">G. Giriat</a>, <a href="/search/cond-mat?searchtype=author&query=Scheerer%2C+G+W">G. W. Scheerer</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G. Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.05172v2-abstract-short" style="display: inline;"> CeAu2Si2 is a newly discovered pressure-induced heavy fermion superconductor which shows very unusual interplay between superconductivity and magnetism under pressure. Here we compare the results of high-pressure measurements on single crystalline CeAu2Si2 samples with different levels of disorder. It is found that while the magnetic properties are essentially sample independent, superconductivity… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05172v2-abstract-full').style.display = 'inline'; document.getElementById('1501.05172v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.05172v2-abstract-full" style="display: none;"> CeAu2Si2 is a newly discovered pressure-induced heavy fermion superconductor which shows very unusual interplay between superconductivity and magnetism under pressure. Here we compare the results of high-pressure measurements on single crystalline CeAu2Si2 samples with different levels of disorder. It is found that while the magnetic properties are essentially sample independent, superconductivity is rapidly suppressed when the residual resistivity of the sample increases. We show that the depression of bulk Tc can be well understood in terms of pair breaking by nonmagnetic disorder, which strongly suggests an unconventional pairing state in pressurized CeAu2Si2. Furthermore, increasing the level of disorder leads to the emergence of another phase transition at T* within the magnetic phase, which might be in competition with superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05172v2-abstract-full').style.display = 'none'; document.getElementById('1501.05172v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 91, 094515 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.1438">arXiv:1406.1438</a> <span> [<a href="https://arxiv.org/pdf/1406.1438">pdf</a>, <a href="https://arxiv.org/ps/1406.1438">ps</a>, <a href="https://arxiv.org/format/1406.1438">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Giant overlap between the magnetic and superconducting phases of CeAu2Si2 under pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Z. Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Pourovskii%2C+L+V">L. V. Pourovskii</a>, <a href="/search/cond-mat?searchtype=author&query=Giriat%2C+G">G. Giriat</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G. Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Georges%2C+A">A. Georges</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1406.1438v2-abstract-short" style="display: inline;"> High pressure provides a powerful means for exploring unconventional superconductivity which appears mostly on the border of magnetism. Here we report the discovery of pressure-induced heavy fermion superconductivity up to 2.5 K in the antiferromanget CeAu2Si2 (TN ~ 10 K). Remarkably, the magnetic and superconducting phases are found to overlap across an unprecedentedly wide pressure interval from… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.1438v2-abstract-full').style.display = 'inline'; document.getElementById('1406.1438v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.1438v2-abstract-full" style="display: none;"> High pressure provides a powerful means for exploring unconventional superconductivity which appears mostly on the border of magnetism. Here we report the discovery of pressure-induced heavy fermion superconductivity up to 2.5 K in the antiferromanget CeAu2Si2 (TN ~ 10 K). Remarkably, the magnetic and superconducting phases are found to overlap across an unprecedentedly wide pressure interval from 11.8 to 22.3 GPa. Moreover, both the bulk Tc and TM are strongly enhanced when increasing the pressure from 16.7 to 20.2 GPa. Tc reaches a maximum at a pressure slightly below pc ~ 22.5 GPa, at which magnetic order disappears. Furthermore, the scaling behavior of the resistivity provides evidence for a continuous delocalization of the Ce 4f-electrons associated with a critical endpoint lying just above pc. We show that the maximum Tc of CeAu2Si2 actually occurs at almost the same unit-cell volume as that of CeCu2Si2 and CeCu2Ge2, and when the Kondo and crystal field splitting energies becomes comparable. Dynamical mean-filed theory calculations suggest that the peculiar behavior in pressurized CeAu2Si2 might be related to its Ce 4f-orbital occupancy. Our results not only provide a unique example of the interplay between superconductivity and magnetism, but also underline the role of orbital physics in understanding Ce-based heavy fermion systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.1438v2-abstract-full').style.display = 'none'; document.getElementById('1406.1438v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures. Supplemental Material available on request</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. X 4, 031055 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.2587">arXiv:1306.2587</a> <span> [<a href="https://arxiv.org/pdf/1306.2587">pdf</a>, <a href="https://arxiv.org/ps/1306.2587">ps</a>, <a href="https://arxiv.org/format/1306.2587">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.88.054110">10.1103/PhysRevB.88.054110 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effect of pressure cycling on Iron: Signatures of an electronic instability and unconventional superconductivity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Yadav%2C+C+S">C. S. Yadav</a>, <a href="/search/cond-mat?searchtype=author&query=Seyfarth%2C+G">G. Seyfarth</a>, <a href="/search/cond-mat?searchtype=author&query=Pedrazzini%2C+P">P. Pedrazzini</a>, <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=%C4%8Cern%C3%BD%2C+R">R. 膶ern媒</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1306.2587v1-abstract-short" style="display: inline;"> High pressure electrical resistivity and x-ray diffraction experiments have been performed on Fe single crystals. The crystallographic investigation provides direct evidence that in the martensitic $bcc \rightarrow hcp$ transition at 14 GPa the $\lbrace 110\rbrace_{bcc}$ become the $\lbrace 002\rbrace_{hcp}$ directions. During a pressure cycle, resistivity shows a broad hysteresis of 6.5 GPa, wher… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.2587v1-abstract-full').style.display = 'inline'; document.getElementById('1306.2587v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.2587v1-abstract-full" style="display: none;"> High pressure electrical resistivity and x-ray diffraction experiments have been performed on Fe single crystals. The crystallographic investigation provides direct evidence that in the martensitic $bcc \rightarrow hcp$ transition at 14 GPa the $\lbrace 110\rbrace_{bcc}$ become the $\lbrace 002\rbrace_{hcp}$ directions. During a pressure cycle, resistivity shows a broad hysteresis of 6.5 GPa, whereas superconductivity, observed between 13 and 31 GPa, remains unaffected. Upon increasing pressure an electronic instability, probably a quantum critical point, is observed at around 19 GPa and, close to this pressure, the superconducting $T_{c}$ and the isothermal resistivity ($0<T<300\,$K) attain maximum values. In the superconducting pressure domain, the exponent $n = 5/3$ of the temperature power law of resistivity and its prefactor, which mimics $T_{c}$, indicate that ferromagnetic fluctuations may provide the glue for the Cooper pairs, yielding unconventional superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.2587v1-abstract-full').style.display = 'none'; document.getElementById('1306.2587v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.1407">arXiv:1306.1407</a> <span> [<a href="https://arxiv.org/pdf/1306.1407">pdf</a>, <a href="https://arxiv.org/ps/1306.1407">ps</a>, <a href="https://arxiv.org/format/1306.1407">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4768936">10.1063/1.4768936 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-plane electronic confinement in superconducting LaAlO$_3$/SrTiO$_3$ nanostructures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stornaiuolo%2C+D">D. Stornaiuolo</a>, <a href="/search/cond-mat?searchtype=author&query=Gariglio%2C+S">S. Gariglio</a>, <a href="/search/cond-mat?searchtype=author&query=Couto%2C+N+J+G">N. J. G. Couto</a>, <a href="/search/cond-mat?searchtype=author&query=Fete%2C+A">A. Fete</a>, <a href="/search/cond-mat?searchtype=author&query=Caviglia%2C+A+D">A. D. Caviglia</a>, <a href="/search/cond-mat?searchtype=author&query=Seyfarth%2C+G">G. Seyfarth</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Morpurgo%2C+A+F">A. F. Morpurgo</a>, <a href="/search/cond-mat?searchtype=author&query=Triscone%2C+J+-">J. -M. Triscone</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1306.1407v1-abstract-short" style="display: inline;"> We describe the transport properties of mesoscopic devices based on the two dimensional electron gas (2DEG) present at the LaAlO$_3$/SrTiO$_3$ interface. Bridges with lateral dimensions down to 500~nm were realized using electron beam lithography. Their detailed characterization shows that processing and confinement do not alter the transport parameters of the 2DEG. The devices exhibit superconduc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.1407v1-abstract-full').style.display = 'inline'; document.getElementById('1306.1407v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.1407v1-abstract-full" style="display: none;"> We describe the transport properties of mesoscopic devices based on the two dimensional electron gas (2DEG) present at the LaAlO$_3$/SrTiO$_3$ interface. Bridges with lateral dimensions down to 500~nm were realized using electron beam lithography. Their detailed characterization shows that processing and confinement do not alter the transport parameters of the 2DEG. The devices exhibit superconducting behavior tunable by electric field effect. In the normal state, we measured universal conductance fluctuations, signature of phase-coherent transport in small structures. The achievement of reliable lateral confinement of the 2DEG opens the way to the realization of quantum electronic devices at the LaAlO$_3$/SrTiO$_3$ interface. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.1407v1-abstract-full').style.display = 'none'; document.getElementById('1306.1407v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Appl. Phys. Lett. 101, 222601 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1111.4873">arXiv:1111.4873</a> <span> [<a href="https://arxiv.org/pdf/1111.4873">pdf</a>, <a href="https://arxiv.org/ps/1111.4873">ps</a>, <a href="https://arxiv.org/format/1111.4873">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.85.205105">10.1103/PhysRevB.85.205105 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Heavy Fermion superconductor CeCu$_2$Si$_2$ under high pressure: multiprobing the valence crossover </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Seyfarth%2C+G">G. Seyfarth</a>, <a href="/search/cond-mat?searchtype=author&query=R%C3%BCetschi%2C+A+-">A. -S. R眉etschi</a>, <a href="/search/cond-mat?searchtype=author&query=Sengupta%2C+K">K. Sengupta</a>, <a href="/search/cond-mat?searchtype=author&query=Georges%2C+A">A. Georges</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+S">S. Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Miyake%2C+K">K. Miyake</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1111.4873v2-abstract-short" style="display: inline;"> The first heavy fermion superconductor CeCu$_2$Si$_2$ has not revealed all its striking mysteries yet. At high pressures, superconductivity is supposed to be mediated by valence fluctuations, in contrast to ambient pressure, where spin fluctuations most likely act as pairing glue. We have carried out a multiprobe (electric transport, thermopower, ac specific heat, Hall and Nernst effects) experime… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.4873v2-abstract-full').style.display = 'inline'; document.getElementById('1111.4873v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.4873v2-abstract-full" style="display: none;"> The first heavy fermion superconductor CeCu$_2$Si$_2$ has not revealed all its striking mysteries yet. At high pressures, superconductivity is supposed to be mediated by valence fluctuations, in contrast to ambient pressure, where spin fluctuations most likely act as pairing glue. We have carried out a multiprobe (electric transport, thermopower, ac specific heat, Hall and Nernst effects) experiment up to $7 \text{GPa}$ on a high quality CeCu$_2$Si$_2$ single crystal. Reliable resistivity data reveal for the first time a scaling behavior close to the supposed valence transition, and allow to locate the critical end point at $4.5\pm0.2 \text{GPa}$ and a slightly negative temperature. In the same pressure region, remarkable features have also been detected in the other physical properties, acting as further signatures of the Ce valence crossover and the associated critical fluctuations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.4873v2-abstract-full').style.display = 'none'; document.getElementById('1111.4873v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 14 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PRB 85, 205105 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1102.2464">arXiv:1102.2464</a> <span> [<a href="https://arxiv.org/pdf/1102.2464">pdf</a>, <a href="https://arxiv.org/ps/1102.2464">ps</a>, <a href="https://arxiv.org/format/1102.2464">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.ssc.2011.03.014">10.1016/j.ssc.2011.03.014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pressure cycle of superconducting Cs0.8Fe2Se2: a transport study </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Seyfarth%2C+G">G. Seyfarth</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Pedrazzini%2C+P">P. Pedrazzini</a>, <a href="/search/cond-mat?searchtype=author&query=Krzton-Maziopa%2C+A">A. Krzton-Maziopa</a>, <a href="/search/cond-mat?searchtype=author&query=Pomjakushina%2C+E">E. Pomjakushina</a>, <a href="/search/cond-mat?searchtype=author&query=Conder%2C+K">K. Conder</a>, <a href="/search/cond-mat?searchtype=author&query=Shermadini%2C+Z">Z. Shermadini</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1102.2464v2-abstract-short" style="display: inline;"> We report measurements of the temperature and pressure dependence of the electrical resistivity of single crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material superconductivity Tc~30K develops from a normal state with extremely large resistivity. At ambient pressure a large "hump" in the resistivity is observed around 200K. Under pressure, the resistivity decreases by two orders of ma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.2464v2-abstract-full').style.display = 'inline'; document.getElementById('1102.2464v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1102.2464v2-abstract-full" style="display: none;"> We report measurements of the temperature and pressure dependence of the electrical resistivity of single crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material superconductivity Tc~30K develops from a normal state with extremely large resistivity. At ambient pressure a large "hump" in the resistivity is observed around 200K. Under pressure, the resistivity decreases by two orders of magnitude, concomitant with a sudden Tc suppression around p~8GPa. Even at 9GPa a metallic resistivity state is not recovered, and the 蟻(T) "hump" is still detected. A comparison of the data measured upon increasing and decreasing the external pressure leads us to suggest that superconductivity is not related to this hump. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.2464v2-abstract-full').style.display = 'none'; document.getElementById('1102.2464v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 February, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Solid State Communications 151 (2011) pp. 747-750 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0807.4137">arXiv:0807.4137</a> <span> [<a href="https://arxiv.org/pdf/0807.4137">pdf</a>, <a href="https://arxiv.org/ps/0807.4137">ps</a>, <a href="https://arxiv.org/format/0807.4137">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.2818788">10.1063/1.2818788 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Adaptation of the Bridgman anvil cell to liquid pressure mediums </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ruetschi%2C+A+-">A. -S. Ruetschi</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0807.4137v1-abstract-short" style="display: inline;"> The advantage of Bridgman anvil pressure cells is their wide pressure range and the large number of wires which can be introduced into the pressure chamber. In these pressure cells soft solid pressure mediums like steatite are used. We have succeeded in adapting the Bridgman cell to liquid pressure mediums. With this breakthrough it is now possible to measure in very good hydrostatic pressure co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.4137v1-abstract-full').style.display = 'inline'; document.getElementById('0807.4137v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0807.4137v1-abstract-full" style="display: none;"> The advantage of Bridgman anvil pressure cells is their wide pressure range and the large number of wires which can be introduced into the pressure chamber. In these pressure cells soft solid pressure mediums like steatite are used. We have succeeded in adapting the Bridgman cell to liquid pressure mediums. With this breakthrough it is now possible to measure in very good hydrostatic pressure conditions up to 7 GPa, which is about twice the pressure attainable in piston-cylinder cells. The pressure gradient in the cell, estimated from the superconducting transition width of lead, is reduced by a factor of five in the liquid medium with respect to steatite. By the use of non-magnetic materials for the anvils and the clamp and due to the small dimensions of the latter, our device is specially suitable for magneto-transport measurements in dilution fridges. This pressure cell has been developed to measure very fragile and brittle samples like organic conductors. Resistivity measurements of (TMTTF)2BF4 performed in a solid and liquid pressure medium demonstrate the necessity of hydrostatic pressure conditions for the study of organic conductors at high pressures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.4137v1-abstract-full').style.display = 'none'; document.getElementById('0807.4137v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 July, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 figures. Published in Review of Scientific Instruments</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Rev. Sci. Instrum. 78, 123901 (2007) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0807.0774">arXiv:0807.0774</a> <span> [<a href="https://arxiv.org/pdf/0807.0774">pdf</a>, <a href="https://arxiv.org/ps/0807.0774">ps</a>, <a href="https://arxiv.org/format/0807.0774">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Superconductor - Normal and Quantum Superconductor-Insulator Transition at the LaAlO3/SrTiO3Interface </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+T">T. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Caviglia%2C+A+D">A. D. Caviglia</a>, <a href="/search/cond-mat?searchtype=author&query=Gariglio%2C+S">S. Gariglio</a>, <a href="/search/cond-mat?searchtype=author&query=Reyren%2C+N">N. Reyren</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Triscone%2C+J+-">J. -M. Triscone</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0807.0774v1-abstract-short" style="display: inline;"> Superconductivity at the interface between the insulators LaAlO3 and SrTiO3 has been tuned with the electric field effect. The data provide evidence for a two dimensional quantum superconductor to insulator (2D-QSI) transition. Here we explore the compatibility of this phase transition line with Berezinskii-Kosterlitz-Thouless (BKT) behavior and a 2D-QSI transition. In an intermediate regime, li… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0774v1-abstract-full').style.display = 'inline'; document.getElementById('0807.0774v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0807.0774v1-abstract-full" style="display: none;"> Superconductivity at the interface between the insulators LaAlO3 and SrTiO3 has been tuned with the electric field effect. The data provide evidence for a two dimensional quantum superconductor to insulator (2D-QSI) transition. Here we explore the compatibility of this phase transition line with Berezinskii-Kosterlitz-Thouless (BKT) behavior and a 2D-QSI transition. In an intermediate regime, limited by a finite size effect, we uncover remarkable consistency with BKT- criticality, weak localization in the insulating state and non-Drude behavior in the normal state. Our estimates for the critical exponents of the 2D-QSI-transition, z =1 and nu=3, suggest that it belongs to the 3D-xy universality class. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0774v1-abstract-full').style.display = 'none'; document.getElementById('0807.0774v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 July, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0807.0585">arXiv:0807.0585</a> <span> [<a href="https://arxiv.org/pdf/0807.0585">pdf</a>, <a href="https://arxiv.org/format/0807.0585">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/nature07576">10.1038/nature07576 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electric Field Control of the LaAlO$_{3}$/SrTiO$_{3}$ Interface Ground State </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Caviglia%2C+A+D">A. D. Caviglia</a>, <a href="/search/cond-mat?searchtype=author&query=Gariglio%2C+S">S. Gariglio</a>, <a href="/search/cond-mat?searchtype=author&query=Reyren%2C+N">N. Reyren</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+T">T. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Gabay%2C+M">M. Gabay</a>, <a href="/search/cond-mat?searchtype=author&query=Thiel%2C+S">S. Thiel</a>, <a href="/search/cond-mat?searchtype=author&query=Hammerl%2C+G">G. Hammerl</a>, <a href="/search/cond-mat?searchtype=author&query=Mannhart%2C+J">J. Mannhart</a>, <a href="/search/cond-mat?searchtype=author&query=Triscone%2C+J+-">J. -M. Triscone</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0807.0585v1-abstract-short" style="display: inline;"> Interfaces between complex oxides are emerging as one of the most interesting playgrounds in condensed matter physics. In this special setting, in which translational symmetry is artificially broken, a variety of novel electronic phases can be promoted. Theoretical studies predict complex phase diagrams and suggest the key role of the carrier density in determining the systems ground states. A p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0585v1-abstract-full').style.display = 'inline'; document.getElementById('0807.0585v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0807.0585v1-abstract-full" style="display: none;"> Interfaces between complex oxides are emerging as one of the most interesting playgrounds in condensed matter physics. In this special setting, in which translational symmetry is artificially broken, a variety of novel electronic phases can be promoted. Theoretical studies predict complex phase diagrams and suggest the key role of the carrier density in determining the systems ground states. A particularly fascinating system is the interface between the insulators LaAlO$_{3}$ and SrTiO$_{3}$, which displays conductivity with high mobility. Recently two possible ground states have been experimentally identified: a magnetic state and a two dimensional (2D) superconducting condensate. In this Letter we use the electric field effect to explore the phase diagram of the system. The electrostatic tuning of the carrier density allows an on/off switching of superconductivity and drives a quantum phase transition (QPT) between a 2D superconducting state and an insulating state (2D-QSI). Analyses of the magnetotransport properties in the insulating state are consistent with weak localisation and do not provide evidence for magnetism. The electric field control of superconductivity demonstrated here opens the way to the development of novel mesoscopic superconducting circuits <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0585v1-abstract-full').style.display = 'none'; document.getElementById('0807.0585v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 July, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0611429">arXiv:cond-mat/0611429</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0611429">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0611429">ps</a>, <a href="https://arxiv.org/format/cond-mat/0611429">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1143/JPSJ.76.051002">10.1143/JPSJ.76.051002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Valence Instability and Superconductivity in Heavy Fermion Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">Alexander T. Holmes</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">Didier Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Miyake%2C+K">Kazumasa Miyake</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0611429v1-abstract-short" style="display: inline;"> Many cerium-based heavy fermion (HF) compounds have pressure-temperature phase diagrams in which a superconducting region extends far from a magnetic quantum critical point. In at least two compounds, CeCu2Si2 and CeCu2Ge2, an enhancement of the superconducting transition temperature was found to coincide with an abrupt valence change, with strong circumstantial evidence for pairing mediated by… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0611429v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0611429v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0611429v1-abstract-full" style="display: none;"> Many cerium-based heavy fermion (HF) compounds have pressure-temperature phase diagrams in which a superconducting region extends far from a magnetic quantum critical point. In at least two compounds, CeCu2Si2 and CeCu2Ge2, an enhancement of the superconducting transition temperature was found to coincide with an abrupt valence change, with strong circumstantial evidence for pairing mediated by critical valence, or charge transfer, fluctuations. This pairing mechanism, and the valence instability, is a consequence of a f-c Coulomb repulsion term U_fc in the hamiltonian. While some non-superconducting Ce compounds show a clear first order valence instability, analogous to the Ce alpha-gamma transition, we argue that a weakly first order valence transition may be a general feature of Ce-based HF systems, and both magnetic and critical valence fluctuations may be responsible for the superconductivity in these systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0611429v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0611429v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 November, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2006. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 16 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0606493">arXiv:cond-mat/0606493</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0606493">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0606493">ps</a>, <a href="https://arxiv.org/format/cond-mat/0606493">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.98.047204">10.1103/PhysRevLett.98.047204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Metallic State in Cubic FeGe beyond its Quantum Phase Transition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pedrazzini%2C+P">P. Pedrazzini</a>, <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Jarlborg%2C+T">T. Jarlborg</a>, <a href="/search/cond-mat?searchtype=author&query=Schmidt%2C+M">M. Schmidt</a>, <a href="/search/cond-mat?searchtype=author&query=Hanfland%2C+M">M. Hanfland</a>, <a href="/search/cond-mat?searchtype=author&query=Akselrud%2C+L">L. Akselrud</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+H+Q">H. Q. Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Schwarz%2C+U">U. Schwarz</a>, <a href="/search/cond-mat?searchtype=author&query=Grin%2C+Y">Yu. Grin</a>, <a href="/search/cond-mat?searchtype=author&query=Steglich%2C+F">F. Steglich</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0606493v1-abstract-short" style="display: inline;"> We report on results of electrical resistivity and structural investigations on the cubic modification of FeGe under high pressure. The long-wavelength helical order ($T_C=280$ K) is suppressed at a critical pressure $p_c\approx 19$ GPa. An anomaly in the resistivity data at $T_X(p)$ and strong deviations from a Fermi-liquid behavior in a wide pressure range above $p_c$ suggest that the suppress… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0606493v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0606493v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0606493v1-abstract-full" style="display: none;"> We report on results of electrical resistivity and structural investigations on the cubic modification of FeGe under high pressure. The long-wavelength helical order ($T_C=280$ K) is suppressed at a critical pressure $p_c\approx 19$ GPa. An anomaly in the resistivity data at $T_X(p)$ and strong deviations from a Fermi-liquid behavior in a wide pressure range above $p_c$ suggest that the suppression of $T_C$ disagrees with the standard notion of a quantum critical phase transition. The metallic ground state persisting at high pressure can be described by band-structure calculations if structural disorder due to zero-point motion is included. Discontinuous changes in the pressure dependence of the shortest Fe-Ge interatomic distance occurring close to the $T_C(p)$ phase line could be interpreted as a symmetry-conserving transition of first order. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0606493v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0606493v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 June, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2006. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 98, 047204 (2007) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0509787">arXiv:cond-mat/0509787</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0509787">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0509787">ps</a>, <a href="https://arxiv.org/format/cond-mat/0509787">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physb.2006.01.123">10.1016/j.physb.2006.01.123 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Valence fluctuation mediated superconductivity in CeCu2Si2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">Alexander T. Holmes</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">Didier Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0509787v1-abstract-short" style="display: inline;"> It has been proposed that there are two types of superconductivity in CeCu2Si2, mediated by spin fluctuations at ambient pressure, and by critical valence fluctuations around a charge instability at a pressure P_v \simeq 4.5 GPa. We present in detail some of the unusual features of this novel type of superconducting state, including the coexistence of superconductivity and huge residual resistiv… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0509787v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0509787v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0509787v1-abstract-full" style="display: none;"> It has been proposed that there are two types of superconductivity in CeCu2Si2, mediated by spin fluctuations at ambient pressure, and by critical valence fluctuations around a charge instability at a pressure P_v \simeq 4.5 GPa. We present in detail some of the unusual features of this novel type of superconducting state, including the coexistence of superconductivity and huge residual resistivity of the order of the Ioffe-Regel limit, large and pressure dependent resistive transition widths in a single crystal measured under hydrostatic conditions, asymmetric pressure dependence of the specific heat jump shape, unrelated to the resistivity width, and negative temperature dependence of the normal state resistivity below 10 K at very high pressure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0509787v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0509787v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 September, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures; Proceedings SCES '05</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0509772">arXiv:cond-mat/0509772</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0509772">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0509772">ps</a>, <a href="https://arxiv.org/format/cond-mat/0509772">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physb.2006.01.062">10.1016/j.physb.2006.01.062 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing the extended non-Fermi liquid regimes of MnSi and Fe </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pedrazzini%2C+P">P. Pedrazzini</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Lapertot%2C+G">G. Lapertot</a>, <a href="/search/cond-mat?searchtype=author&query=Flouquet%2C+J">J. Flouquet</a>, <a href="/search/cond-mat?searchtype=author&query=Inada%2C+Y">Y. Inada</a>, <a href="/search/cond-mat?searchtype=author&query=Kohara%2C+H">H. Kohara</a>, <a href="/search/cond-mat?searchtype=author&query=Onuki%2C+Y">Y. Onuki</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0509772v1-abstract-short" style="display: inline;"> Recent studies show that the non-Fermi liquid (NFL) behavior of MnSi and Fe spans over an unexpectedly broad pressure range, between the critical pressure p_c and around 2p_c. In order to determine the extension of their NFL regions, we analyze the evolution of the resistivity rho(T) A(p)T^n at higher pressures. We find that in MnSi the n=3/2 exponent holds below 4.8 GPa=3 p_c, but it increases… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0509772v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0509772v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0509772v1-abstract-full" style="display: none;"> Recent studies show that the non-Fermi liquid (NFL) behavior of MnSi and Fe spans over an unexpectedly broad pressure range, between the critical pressure p_c and around 2p_c. In order to determine the extension of their NFL regions, we analyze the evolution of the resistivity rho(T) A(p)T^n at higher pressures. We find that in MnSi the n=3/2 exponent holds below 4.8 GPa=3 p_c, but it increases above that pressure. At 7.2 GPa we observe the low temperature Fermi liquid exponent n=2 whereas for T>1.5 K, n=5/3. Our measurements in Fe show that the NFL behavior rho T^{5/3} extends at least up to 30.5 GPa, above the entire superconducting (SC) region. In the studied pressure range, the onset of the SC transition reduces by a factor 10 down to T_c^onset(30.5 GPa)=0.23 K, while the A-coefficient diminishes monotonically by around 50%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0509772v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0509772v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 September, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">2 pages, 2 figures, Proceedings SCES 2005</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physica B 378-380 (2006) 165-166 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0508073">arXiv:cond-mat/0508073</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0508073">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0508073">ps</a>, <a href="https://arxiv.org/format/cond-mat/0508073">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1117/12.616888">10.1117/12.616888 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Epitaxial growth and transport properties of Nb-doped SrTiO$_{3}$ thin films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Takahashi%2C+K+S">K. S. Takahashi</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Shibuya%2C+K">K. Shibuya</a>, <a href="/search/cond-mat?searchtype=author&query=Ohnishi%2C+T">T. Ohnishi</a>, <a href="/search/cond-mat?searchtype=author&query=Lippmaa%2C+M">M. Lippmaa</a>, <a href="/search/cond-mat?searchtype=author&query=Triscone%2C+J+-">J. -M. Triscone</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0508073v1-abstract-short" style="display: inline;"> Nb-doped SrTiO$_{3}$ epitaxial thin films have been prepared on (001) SrTiO$_{3}$ substrates using pulsed laser deposition. A high substrate temperature ($>1000^{\circ}{C}$) was found to be necessary to achieve 2-dimensional growth. Atomic force microscopy reveals atomically flat surfaces with 3.9 脜$ $ steps. The films show a metallic behavior, residual resistivity ratios between 10 and 100, and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0508073v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0508073v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0508073v1-abstract-full" style="display: none;"> Nb-doped SrTiO$_{3}$ epitaxial thin films have been prepared on (001) SrTiO$_{3}$ substrates using pulsed laser deposition. A high substrate temperature ($>1000^{\circ}{C}$) was found to be necessary to achieve 2-dimensional growth. Atomic force microscopy reveals atomically flat surfaces with 3.9 脜$ $ steps. The films show a metallic behavior, residual resistivity ratios between 10 and 100, and low residual resistivity of the order of 10$^{-4}$$惟$cm. At 0.3 K, a sharp superconducting transition, reaching zero resistance, is observed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0508073v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0508073v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 August, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proc. SPIE Vol. 5932, p. 267-27, (2005) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0505613">arXiv:cond-mat/0505613</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0505613">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0505613">ps</a>, <a href="https://arxiv.org/format/cond-mat/0505613">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/17/35/009">10.1088/0953-8984/17/35/009 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anisotropy, disorder, and superconductivity in CeCu2Si2 under high pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">A. T. Holmes</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Jeevan%2C+H+S">H. S. Jeevan</a>, <a href="/search/cond-mat?searchtype=author&query=Geibel%2C+C">C. Geibel</a>, <a href="/search/cond-mat?searchtype=author&query=Ishikawa%2C+M">M. Ishikawa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0505613v1-abstract-short" style="display: inline;"> Resistivity measurements were carried out up to 8 GPa on single crystal and polycrystalline samples of CeCu2Si2 from differing sources in the homogeneity range. The anisotropic response to current direction and small uniaxial stresses was explored, taking advantage of the quasi-hydrostatic environment of the Bridgman anvil cell. It was found that both the superconducting transition temperature T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0505613v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0505613v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0505613v1-abstract-full" style="display: none;"> Resistivity measurements were carried out up to 8 GPa on single crystal and polycrystalline samples of CeCu2Si2 from differing sources in the homogeneity range. The anisotropic response to current direction and small uniaxial stresses was explored, taking advantage of the quasi-hydrostatic environment of the Bridgman anvil cell. It was found that both the superconducting transition temperature Tc and the normal state properties are very sensitive to uniaxial stress, which leads to a shift of the valence instability pressure Pv and a small but significant change in Tc for different orientations with respect to the tetragonal c-axis. Coexistence of superconductivity and residual resistivity close to the Ioffe-Regel limit around 5 GPa provides a compelling argument for the existence of a valence-fluctuation mediated pairing interaction at high pressure in CeCu2Si2. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0505613v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0505613v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 May, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 17 (2005) 5423-5432. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0503547">arXiv:cond-mat/0503547</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0503547">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/17/26/012">10.1088/0953-8984/17/26/012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evolution of the specific-heat anomaly of the high-temperature superconductor YBa2Cu3O7 under influence of doping through application of pressure up to 10 GPa </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lortz%2C+R">Rolf Lortz</a>, <a href="/search/cond-mat?searchtype=author&query=Junod%2C+A">Alain Junod</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">Didier Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yuxing Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Meingast%2C+C">Christoph Meingast</a>, <a href="/search/cond-mat?searchtype=author&query=Masui%2C+T">Takahiko Masui</a>, <a href="/search/cond-mat?searchtype=author&query=Tajima%2C+S">Setsuko Tajima</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0503547v3-abstract-short" style="display: inline;"> The evolution of the specific-heat anomaly in the overdoped range of a single crystal of the high-temperature superconductor YBa2Cu3O7 has been studied under influence of pressure up to 10 GPa, using AC calorimetry in a Bridgman-type pressure cell. We show that the specific-heat jump as well as the bulk Tc are reduced with increasing pressure in accordance with a simple charge-transfer model. Th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0503547v3-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0503547v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0503547v3-abstract-full" style="display: none;"> The evolution of the specific-heat anomaly in the overdoped range of a single crystal of the high-temperature superconductor YBa2Cu3O7 has been studied under influence of pressure up to 10 GPa, using AC calorimetry in a Bridgman-type pressure cell. We show that the specific-heat jump as well as the bulk Tc are reduced with increasing pressure in accordance with a simple charge-transfer model. This new method enables us through pressure-induced charge transfer to study the doping dependence of the superconducting transition, as well as the evolution of the superconducting condensation energy on a single stoichometric sample without adding atomic disorder. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0503547v3-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0503547v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 June, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 March, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">final version: J. Phys.: Condens. Matter 17 (2005) 4135-4145</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 17 (2005) 4135-4145 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0410143">arXiv:cond-mat/0410143</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0410143">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Spin and Valence-Fluctuation Mediated Superconductivity in Pressurized Fe and CeCu2(Si/Ge)2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">Alexander T. Holmes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0410143v1-abstract-short" style="display: inline;"> We review the evidence supporting valence-fluctuation mediated superconductivity in CeCu2Si2 and CeCu2Ge2, where Tc reaches 2.4 K at high pressure. In these systems the valence and magnetic critical points, at p_V and p_c respectively, are well separated. Characteristic signatures associated with both phenomena are distinct. In contrast, the valence and spin fluctuation regions appear much close… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0410143v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0410143v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0410143v1-abstract-full" style="display: none;"> We review the evidence supporting valence-fluctuation mediated superconductivity in CeCu2Si2 and CeCu2Ge2, where Tc reaches 2.4 K at high pressure. In these systems the valence and magnetic critical points, at p_V and p_c respectively, are well separated. Characteristic signatures associated with both phenomena are distinct. In contrast, the valence and spin fluctuation regions appear much closer in most Ce based compounds. Concerning d-transition metals, superconductivity in pure iron emerges in the pressure window 15-30 GPa with the onset of Tc up to almost 3 K. All relevant observations point to unconventional superconductivity, likely mediated by ferromagnetic spin fluctuations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0410143v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0410143v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 October, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, Proceedings of SCES'04, submitted to Physica B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0408280">arXiv:cond-mat/0408280</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0408280">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0408280">ps</a>, <a href="https://arxiv.org/format/cond-mat/0408280">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/17/11/012">10.1088/0953-8984/17/11/012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-pressure transport properties of CeRu_2Ge_2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Zlatic%2C+V">V. Zlatic</a>, <a href="/search/cond-mat?searchtype=author&query=Monnier%2C+R">R. Monnier</a>, <a href="/search/cond-mat?searchtype=author&query=Delley%2C+B">B. Delley</a>, <a href="/search/cond-mat?searchtype=author&query=Coqblin%2C+B">B. Coqblin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0408280v1-abstract-short" style="display: inline;"> The pressure-induced changes in the temperature-dependent thermopower S(T) and electrical resistivity 蟻(T) of CeRu_2Ge_2 are described within the single-site Anderson model. The Ce-ions are treated as impurities and the coherent scattering on different Ce-sites is neglected. Changing the hybridisation 螕between the 4f-states and the conduction band accounts for the pressure effect. The transport… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0408280v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0408280v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0408280v1-abstract-full" style="display: none;"> The pressure-induced changes in the temperature-dependent thermopower S(T) and electrical resistivity 蟻(T) of CeRu_2Ge_2 are described within the single-site Anderson model. The Ce-ions are treated as impurities and the coherent scattering on different Ce-sites is neglected. Changing the hybridisation 螕between the 4f-states and the conduction band accounts for the pressure effect. The transport coefficients are calculated in the non-crossing approximation above the phase boundary line. The theoretical S(T) and 蟻(T) curves show many features of the experimental data. The seemingly complicated temperature dependence of S(T) and 蟻(T), and their evolution as a function of pressure, is related to the crossovers between various fixed points of the model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0408280v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0408280v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 August, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 17 (2005) S823-S836 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0405030">arXiv:cond-mat/0405030</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0405030">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0405030">ps</a>, <a href="https://arxiv.org/format/cond-mat/0405030">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/16/28/037">10.1088/0953-8984/16/28/037 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On the thermoelectricity of correlated electrons in the zero-temperature limit </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Behnia%2C+K">Kamran Behnia</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">Didier Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Flouquet%2C+J">Jacques Flouquet</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0405030v1-abstract-short" style="display: inline;"> The Seebeck coefficient of a metal is expected to display a linear temperature-dependence in the zero-temperature limit. To attain this regime, it is often necessary to cool the system well below 1K. We put under scrutiny the magnitude of this term in different families of strongly-interacting electronic systems. For a wide range of compounds (including heavy-fermion, organic and various oxide f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0405030v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0405030v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0405030v1-abstract-full" style="display: none;"> The Seebeck coefficient of a metal is expected to display a linear temperature-dependence in the zero-temperature limit. To attain this regime, it is often necessary to cool the system well below 1K. We put under scrutiny the magnitude of this term in different families of strongly-interacting electronic systems. For a wide range of compounds (including heavy-fermion, organic and various oxide families) a remarkable correlation between this term and the electronic specific heat is found. We argue that a dimensionless ratio relating these two signatures of mass renormalisation contains interesting information about the ground state of each system. The absolute value of this ratio remains close to unity in a wide range of strongly-correlated electron systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0405030v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0405030v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 May, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, including two figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.:Condens. Matter 16, 5187(2004) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0402187">arXiv:cond-mat/0402187</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0402187">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0402187">ps</a>, <a href="https://arxiv.org/format/cond-mat/0402187">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.69.214408">10.1103/PhysRevB.69.214408 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing the phase diagram of CeRu_2Ge_2 by thermopower at high pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0402187v1-abstract-short" style="display: inline;"> The temperature dependence of the thermoelectric power, S(T), and the electrical resistivity of the magnetically ordered CeRu_2Ge_2 (T_N=8.55 K and T_C=7.40 K) were measured for pressures p < 16 GPa in the temperature range 1.2 K < T < 300 K. Long-range magnetic order is suppressed at a p_c of approximately 6.4 GPa. Pressure drives S(T) through a sequence of temperature dependences, ranging from… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0402187v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0402187v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0402187v1-abstract-full" style="display: none;"> The temperature dependence of the thermoelectric power, S(T), and the electrical resistivity of the magnetically ordered CeRu_2Ge_2 (T_N=8.55 K and T_C=7.40 K) were measured for pressures p < 16 GPa in the temperature range 1.2 K < T < 300 K. Long-range magnetic order is suppressed at a p_c of approximately 6.4 GPa. Pressure drives S(T) through a sequence of temperature dependences, ranging from a behaviour characteristic for magnetically ordered heavy fermion compounds to a typical behaviour of intermediate-valent systems. At intermediate pressures a large positive maximum develops above 10 K in S(T). Its origin is attributed to the Kondo effect and its position is assumed to reflect the Kondo temperature T_K. The pressure dependence of T_K is discussed in a revised and extended (T,p) phase diagram of CeRu_2Ge_2. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0402187v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0402187v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 69, 214408 (2004) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0310519">arXiv:cond-mat/0310519</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0310519">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0310519">ps</a>, <a href="https://arxiv.org/format/cond-mat/0310519">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Unconventional superconductivity and normal state properties of epsilon-iron at high pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">A. T. Holmes</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Behr%2C+G">G. Behr</a>, <a href="/search/cond-mat?searchtype=author&query=Inada%2C+Y">Y. Inada</a>, <a href="/search/cond-mat?searchtype=author&query=Onuki%2C+Y">Y. Onuki</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0310519v1-abstract-short" style="display: inline;"> Following the discovery of superconductivity in epsilon-iron, subsequent experiments hinted at non-Fermi liquid behaviour of the normal phase and sensitive dependence of the superconducting state on disorder, both signatures of unconventional pairing. We report further resistive measurements under pressure of samples of iron from multiple sources. The normal state resistivity of epsilon-iron var… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0310519v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0310519v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0310519v1-abstract-full" style="display: none;"> Following the discovery of superconductivity in epsilon-iron, subsequent experiments hinted at non-Fermi liquid behaviour of the normal phase and sensitive dependence of the superconducting state on disorder, both signatures of unconventional pairing. We report further resistive measurements under pressure of samples of iron from multiple sources. The normal state resistivity of epsilon-iron varied as rho_0+AT^{5/3} at low temperature over the entire superconducting pressure domain. The superconductivity could be destroyed by mechanical work, and was restored by annealing, demonstrating sensitivity to the residual resistivity rho_0. There is a strong correlation between the rho_0 and A coefficients and the superconducting critical temperature T_c. Within the partial resistive transition there was a significant current dependence, with V(I)=a(I-I_0)+bI^2, with a >> b, possibly indicating flux-flow resistivity, even in the absence of an externally applied magnetic field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0310519v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0310519v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 October, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of AIRAPT 19/EHPRG 41, Bordeaux 2003</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0306054">arXiv:cond-mat/0306054</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0306054">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0306054">ps</a>, <a href="https://arxiv.org/format/cond-mat/0306054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.69.024508">10.1103/PhysRevB.69.024508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Signatures of valence fluctuations in CeCu2Si2 under high pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">A. T. Holmes</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Miyake%2C+K">K. Miyake</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0306054v1-abstract-short" style="display: inline;"> Simultaneous resistivity and a.c.-specific heat measurements have been performed under pressure on single crystalline CeCu2Si2 to over 6 GPa in a hydrostatic helium pressure medium. A series of anomalies were observed around the pressure coinciding with a maximum in the superconducting critical temperature, $T_c^{max}$. These anomalies can be linked with an abrupt change of the Ce valence, and s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0306054v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0306054v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0306054v1-abstract-full" style="display: none;"> Simultaneous resistivity and a.c.-specific heat measurements have been performed under pressure on single crystalline CeCu2Si2 to over 6 GPa in a hydrostatic helium pressure medium. A series of anomalies were observed around the pressure coinciding with a maximum in the superconducting critical temperature, $T_c^{max}$. These anomalies can be linked with an abrupt change of the Ce valence, and suggest a second quantum critical point at a pressure $P_v \simeq 4.5$ GPa, where critical valence fluctuations provide the superconducting pairing mechanism, as opposed to spin fluctuations at ambient pressure. Such a valence instability, and associated superconductivity, is predicted by an extended Anderson lattice model with Coulomb repulsion between the conduction and f-electrons. We explain the T-linear resistivity found at $P_v$ in this picture, while other anomalies found around $P_v$ can be qualitatively understood using the same model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0306054v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0306054v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 June, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to Phys. Rev. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 69, 024508 (2004) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0205557">arXiv:cond-mat/0205557</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0205557">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0205557">ps</a>, <a href="https://arxiv.org/format/cond-mat/0205557">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0375-9601(02)00725-9">10.1016/S0375-9601(02)00725-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Superconductivity of epsilon-Fe: complete resistive transition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">A. T. Holmes</a>, <a href="/search/cond-mat?searchtype=author&query=Behr%2C+G">G. Behr</a>, <a href="/search/cond-mat?searchtype=author&query=Inada%2C+Y">Y. Inada</a>, <a href="/search/cond-mat?searchtype=author&query=Onuki%2C+Y">Y. Onuki</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0205557v1-abstract-short" style="display: inline;"> Last year, iron was reported to become superconducting at temperatures below 2K and pressures between 15 and 30 GPa. The evidence presented was a weak resistivity drop, suppressed by a magnetic field above 0.2 T, and a small Meissner signal. However, a compelling demonstration, such as the occurrence of zero resistance, was lacking. Here we report the measurement of a complete resistive transiti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0205557v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0205557v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0205557v1-abstract-full" style="display: none;"> Last year, iron was reported to become superconducting at temperatures below 2K and pressures between 15 and 30 GPa. The evidence presented was a weak resistivity drop, suppressed by a magnetic field above 0.2 T, and a small Meissner signal. However, a compelling demonstration, such as the occurrence of zero resistance, was lacking. Here we report the measurement of a complete resistive transition at 22.2 GPa with an onset slightly above 2 K in two very pure samples of iron, of different origins. The superconductivity appears unusually sensitive to disorder, developing only when the electronic mean free path is above a threshold value, while the normal state resistivity is characteristic of a nearly ferromagnetic metal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0205557v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0205557v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures. To be published in Physics Letters A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters A, Vol. 299 (2-3) (2002) pp. 282-286. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0204559">arXiv:cond-mat/0204559</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0204559">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0204559">ps</a>, <a href="https://arxiv.org/format/cond-mat/0204559">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.66.064428">10.1103/PhysRevB.66.064428 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Calorimetric and transport investigations of CePd_{2+x}Ge_{2-x} (x=0 and 0.02) up to 22 GPa </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0204559v1-abstract-short" style="display: inline;"> The influence of pressure on the magnetically ordered CePd_{2.02}Ge_{1.98} has been investigated by a combined measurement of electrical resistivity, $蟻(T)$, and ac-calorimetry, C(T), for temperatures in the range 0.3 K<T<10 K and pressures, p, up to 22 GPa. Simultaneously CePd_2Ge_2 has been examined by $蟻(T)$ down to 40 mK. In CePd_{2.02}Ge_{1.98} and CePd_2Ge_2 the magnetic order is suppresse… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0204559v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0204559v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0204559v1-abstract-full" style="display: none;"> The influence of pressure on the magnetically ordered CePd_{2.02}Ge_{1.98} has been investigated by a combined measurement of electrical resistivity, $蟻(T)$, and ac-calorimetry, C(T), for temperatures in the range 0.3 K<T<10 K and pressures, p, up to 22 GPa. Simultaneously CePd_2Ge_2 has been examined by $蟻(T)$ down to 40 mK. In CePd_{2.02}Ge_{1.98} and CePd_2Ge_2 the magnetic order is suppressed at a critical pressure p_c=11.0 GPa and p_c=13.8 GPa, respectively. In the case of CePd_{2.02}Ge_{1.98} not only the temperature coefficient of $蟻(T)$, A, indicates the loss of magnetic order but also the ac-signal $1/V_{ac}\propto C/T$ recorded at low temperature. The residual resistivity is extremely pressure sensitive and passes through a maximum and then a minimum in the vicinity of p_c. The (T,p) phase diagram and the A(p)-dependence of both compounds can be qualitatively understood in terms of a pressure-tuned competition between magnetic order and the Kondo effect according to the Doniach picture. The temperature-volume (T,V) phase diagram of CePd_2Ge_2 combined with that of CePd_2Si_2 shows that in stoichiometric compounds mainly the change of interatomic distances influences the exchange interaction. It will be argued that in contrast to this the much lower p_c-value of CePd_{2.02}Ge_{1.98} is caused by an enhanced hybridization between 4f and conduction electrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0204559v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0204559v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 April, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 66, 064428 (2002) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0202390">arXiv:cond-mat/0202390</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0202390">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0202390">ps</a>, <a href="https://arxiv.org/format/cond-mat/0202390">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/14/28/102">10.1088/0953-8984/14/28/102 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Strain enhancement of superconductivity in CePd2Si2 under pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Demuer%2C+A">A. Demuer</a>, <a href="/search/cond-mat?searchtype=author&query=Holmes%2C+A+T">A. T. Holmes</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0202390v1-abstract-short" style="display: inline;"> We report resistivity and calorimetric measurements on two single crystals of CePd2Si2 pressurized up to 7.4 GPa. A weak uniaxial stress induced in the pressure cell demonstrates the sensitivity of the physics to anisotropy. Stress applied along the c-axis extends the whole phase diagram to higher pressures and enhances the superconducting phase emerging around the magnetic instability, with a 4… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0202390v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0202390v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0202390v1-abstract-full" style="display: none;"> We report resistivity and calorimetric measurements on two single crystals of CePd2Si2 pressurized up to 7.4 GPa. A weak uniaxial stress induced in the pressure cell demonstrates the sensitivity of the physics to anisotropy. Stress applied along the c-axis extends the whole phase diagram to higher pressures and enhances the superconducting phase emerging around the magnetic instability, with a 40% increase of the maximum superconducting temperature, Tc, and a doubled pressure range. Calorimetric measurements demonstrate the bulk nature of the superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0202390v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0202390v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 February, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0007322">arXiv:cond-mat/0007322</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0007322">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0007322">ps</a>, <a href="https://arxiv.org/format/cond-mat/0007322">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/13/17/102">10.1088/0953-8984/13/17/102 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pressure-induced residual resistivity anomaly in CeCu_5Au </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">S. Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Stockert%2C+O">O. Stockert</a>, <a href="/search/cond-mat?searchtype=author&query=Loehneysen%2C+H+v">H. v. Loehneysen</a>, <a href="/search/cond-mat?searchtype=author&query=Rosch%2C+A">A. Rosch</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0007322v1-abstract-short" style="display: inline;"> The electrical resistivity of the magnetically ordered CeCu_5Au has been investigated under pressure up to 8.5 GPa. In the magnetically ordered region (p<3.4 GPa) the residual resistivity rho_0 shows a pronounced maximum as a function of pressure. Even in the nonmagnetic region rho_0 decreases monotonically by more than a factor of three. These two effects can be qualitatively explained in terms… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0007322v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0007322v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0007322v1-abstract-full" style="display: none;"> The electrical resistivity of the magnetically ordered CeCu_5Au has been investigated under pressure up to 8.5 GPa. In the magnetically ordered region (p<3.4 GPa) the residual resistivity rho_0 shows a pronounced maximum as a function of pressure. Even in the nonmagnetic region rho_0 decreases monotonically by more than a factor of three. These two effects can be qualitatively explained in terms of the interplay of pressure, magnetism and disorder in a strongly correlated electron system with weak disorder. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0007322v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0007322v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 July, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2000. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures, revtex</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 13 (2001) L329-L335 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0005378">arXiv:cond-mat/0005378</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0005378">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0005378">ps</a>, <a href="https://arxiv.org/format/cond-mat/0005378">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/13/4/104">10.1088/0953-8984/13/4/104 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> From spin-Peierls to superconductivity: (TMTTF)_2PF_6 under high pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Jerome%2C+D">D. Jerome</a>, <a href="/search/cond-mat?searchtype=author&query=Moser%2C+J">J. Moser</a>, <a href="/search/cond-mat?searchtype=author&query=Carcel%2C+C">C. Carcel</a>, <a href="/search/cond-mat?searchtype=author&query=Fabre%2C+J+M">J. M. Fabre</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0005378v1-abstract-short" style="display: inline;"> The nature of the attractive electron-electron interaction, leading to the formation of Cooper-pairs in unconventional superconductors has still to be fully understood and is subject to intensive research. Here we show that the sequence spin-Peierls, antiferromagnetism, superconductivity observed in (TMTTF)_2PF_6 under pressure makes the (TM)_2X phase diagram universal. We argue that the suppres… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0005378v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0005378v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0005378v1-abstract-full" style="display: none;"> The nature of the attractive electron-electron interaction, leading to the formation of Cooper-pairs in unconventional superconductors has still to be fully understood and is subject to intensive research. Here we show that the sequence spin-Peierls, antiferromagnetism, superconductivity observed in (TMTTF)_2PF_6 under pressure makes the (TM)_2X phase diagram universal. We argue that the suppression of the spin-Peierls transition under pressure, the close vicinity of antiferromagnetic and superconducting phases at high pressure as well as the existence of critical antiferromagnetic fluctuations above T_c strongly support the intriguing possibility that the interchain exchange of antiferromagnetic fluctuations provides the pairing mechanism required for bound charge carriers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0005378v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0005378v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 May, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2000. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, revtex, 4 figures (jpeg,eps,png)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 13 (2001) L89-L95 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/9910050">arXiv:cond-mat/9910050</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9910050">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9910050">ps</a>, <a href="https://arxiv.org/format/cond-mat/9910050">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0038-1098(99)00505-0">10.1016/S0038-1098(99)00505-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Calorimetric Investigation of CeRu2Ge2 up to 8 GPa </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bouquet%2C+F">F. Bouquet</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Y. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Junod%2C+A">A. Junod</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/9910050v1-abstract-short" style="display: inline;"> We have developed a calorimeter able to give a qualitative picture of the specific heat of a sample under high pressure up to approximately 10 GPa. The principle of ac-calorimetry was adapted to the conditions in a high pressure clamp. The performance of this technique was successfully tested with the measurement of the specific heat of CeRu2Ge2 in the temperature range 1.5 K<T<12 K. The phase d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9910050v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9910050v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9910050v1-abstract-full" style="display: none;"> We have developed a calorimeter able to give a qualitative picture of the specific heat of a sample under high pressure up to approximately 10 GPa. The principle of ac-calorimetry was adapted to the conditions in a high pressure clamp. The performance of this technique was successfully tested with the measurement of the specific heat of CeRu2Ge2 in the temperature range 1.5 K<T<12 K. The phase diagram of its magnetic phases is consistent with previous transport measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9910050v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9910050v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 October, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 1999. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Solid State Commun. 113 (2000) 367-371 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/9908442">arXiv:cond-mat/9908442</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9908442">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9908442">ps</a>, <a href="https://arxiv.org/format/cond-mat/9908442">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> From an antiferromagnet to a heavy-fermion system: CeCu5Au under pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a>, <a href="/search/cond-mat?searchtype=author&query=Raymond%2C+S">S. Raymond</a>, <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Stockert%2C+O">O. Stockert</a>, <a href="/search/cond-mat?searchtype=author&query=Loehneysen%2C+H+v">H. v. Loehneysen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/9908442v1-abstract-short" style="display: inline;"> The electrical resistivity rho(T) of single crystalline CeCu_5Au under pressure was measured in the temperature range 30mK<T<300K. Pressure suppresses the antiferromagnetic order (T_N=2.35K at ambient pressure) and drives the system into a non-magnetic heavy-fermion state above P_c=4.1(3)GPa. The electrical resistivity shows a deviation from a T^2 dependence of a Fermi-liquid in the pressure ran… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9908442v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9908442v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9908442v1-abstract-full" style="display: none;"> The electrical resistivity rho(T) of single crystalline CeCu_5Au under pressure was measured in the temperature range 30mK<T<300K. Pressure suppresses the antiferromagnetic order (T_N=2.35K at ambient pressure) and drives the system into a non-magnetic heavy-fermion state above P_c=4.1(3)GPa. The electrical resistivity shows a deviation from a T^2 dependence of a Fermi-liquid in the pressure range 1.8GPa<=P<=5.15GPa. The rho(T)-curves can be compared with those of CeCu_{6-x}Au_x at different Au concentrations. Just before the long-range magnetic order vanishes, a possibly superconducting phase (at T_c=0.1K and P=3.84GPa) occurs, pointing to a coexistence of antiferromagnetic order and superconductivity. This new phase is only seen in a narrow pressure interval Delta P=0.4GPa. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9908442v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9908442v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 August, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 1999. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, RevTex, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science and Technology of High Pressure, Proceedings of AIRAPT-17, edited by M.H. Manghnani, W.J. Nellis, M.F. Nicol, pp.697-700, Universities Press, Hyderabad, India, 2000 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/9711089">arXiv:cond-mat/9711089</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9711089">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Transport Properties of Heavy Fermion Compounds </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jaccard%2C+D">D. Jaccard</a>, <a href="/search/cond-mat?searchtype=author&query=Vargoz%2C+E">E. Vargoz</a>, <a href="/search/cond-mat?searchtype=author&query=Alami-Yadri%2C+K">K. Alami-Yadri</a>, <a href="/search/cond-mat?searchtype=author&query=Wilhelm%2C+H">H. Wilhelm</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/9711089v1-abstract-short" style="display: inline;"> A technique for measuring the electrical resistivity and absolute thermopower is presented for pressures up to 30 GPa, temperatures down to 25 mK and magnetic fields up to 10 T. With the examples of CeCu2Ge2 and CeCu2Si2 we focus on the interplay of normal phase and superconducting properties. With increasing pres- sure, the behaviour of CeCu2Ge2 evolves from that of an antiferromagnetically ord… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9711089v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9711089v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9711089v1-abstract-full" style="display: none;"> A technique for measuring the electrical resistivity and absolute thermopower is presented for pressures up to 30 GPa, temperatures down to 25 mK and magnetic fields up to 10 T. With the examples of CeCu2Ge2 and CeCu2Si2 we focus on the interplay of normal phase and superconducting properties. With increasing pres- sure, the behaviour of CeCu2Ge2 evolves from that of an antiferromagnetically ordered Kondo system to that characteristic of an intermediate valence compound as the Kondo temperature increases by about two orders of magnitude. In the pressure window 8-10 < P < 20 GPa, a superconducting phase occurs which com- petes at low pressure with magnetic ordering. For CeCu2Si2 the effective mass of carriers is probed by both the coefficient of the Fermi liquid law and the ini- tial slope of the upper critical field. The magnetic instability is studied no- tably for CeRu2Ge2 and Yb-based compounds for which pressure-induced magnetic ordering tends to develop. Finally, contrary to conventional wisdom, we argue that in heavy fermions a large part of the residual resistivity is most likely not independent of temperature; tentatively ascribed to Kondo hole, it can be very pressure as well as sample dependent. [electrical resistivity, thermoelectric power, heavy fermion, magnetic order, superconductivity] <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9711089v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9711089v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 November, 1997; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 1997. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages Proc. Joint Conf.: AIRAPT-16 & HPCJ-38 (Kyoto 1997). To be published in The Review of High Pressure Science and Technology</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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