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</div> <div class="control"> <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/1908.08614">arXiv:1908.08614</a> <span> [<a href="https://arxiv.org/pdf/1908.08614">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</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/10.1088/1361-6668/ab5e12">10.1088/1361-6668/ab5e12 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Composite stacks for reliable > 17 T trapped fields in bulk superconductor magnets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Huang%2C+K+Y">Kai Yuan Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Yunhua Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Srp%C4%8Di%C4%8D%2C+J">Jan Srp膷i膷</a>, <a href="/search/cond-mat?searchtype=author&query=Ainslie%2C+M+D">Mark D Ainslie</a>, <a href="/search/cond-mat?searchtype=author&query=Namburi%2C+D+K">Devendra K Namburi</a>, <a href="/search/cond-mat?searchtype=author&query=Dennis%2C+A+R">Anthony R Dennis</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+D">Difan Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Boll%2C+M">Martin Boll</a>, <a href="/search/cond-mat?searchtype=author&query=Filipenko%2C+M">Mykhaylo Filipenko</a>, <a href="/search/cond-mat?searchtype=author&query=Jaroszynski%2C+J">Jan Jaroszynski</a>, <a href="/search/cond-mat?searchtype=author&query=Hellstrom%2C+E+E">Eric E Hellstrom</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">David A Cardwell</a>, <a href="/search/cond-mat?searchtype=author&query=Durrell%2C+J+H">John H Durrell</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="1908.08614v2-abstract-short" style="display: inline;"> Trapped fields of over 20 T are, in principle, achievable in bulk, single-grain high temperature cuprate superconductors. The principle barriers to realizing such performance are, firstly, the large tensile stresses that develop during the magnetization of such trapped-field magnets as a result of the Lorentz force, which lead to brittle fracture of these ceramic-like materials at high fields and,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.08614v2-abstract-full').style.display = 'inline'; document.getElementById('1908.08614v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.08614v2-abstract-full" style="display: none;"> Trapped fields of over 20 T are, in principle, achievable in bulk, single-grain high temperature cuprate superconductors. The principle barriers to realizing such performance are, firstly, the large tensile stresses that develop during the magnetization of such trapped-field magnets as a result of the Lorentz force, which lead to brittle fracture of these ceramic-like materials at high fields and, secondly, catastrophic thermal instabilities as a result of flux movement during magnetization. Moreover, for a batch of samples nominally fabricated identically, the statistical nature of the failure mechanism means the best performance (i.e. trapped fields of over 17 T) cannot be attained reliably. The magnetization process, particularly to higher fields, also often damages the samples such that they cannot repeatedly trap high fields following subsequent magnetization. In this study, we report the sequential trapping of magnetic fields of ~ 17 T, achieving 16.8 T at 26 K initially and 17.6 T at 22.5 K subsequently, in a stack of two Ag-doped GdBa2Cu3O7-未 bulk superconductor composites of diameter 24 mm reinforced with (1) stainless-steel laminations, and (2) shrink-fit stainless steel rings. A trapped field of 17.6 T is, in fact, comparable with the highest trapped fields reported to date for bulk superconducting magnets of any mechanical and chemical composition, and this was achieved using the first composite stack to be fabricated by this technique. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.08614v2-abstract-full').style.display = 'none'; document.getElementById('1908.08614v2-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 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2019. </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">Accepted revised version for Superconductor Science and Technology</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1701.00266">arXiv:1701.00266</a> <span> [<a href="https://arxiv.org/pdf/1701.00266">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/10.1063/1.4973991">10.1063/1.4973991 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A portable magnetic field of > 3 T generated by the flux jump assisted, pulsed field magnetisation of bulk superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+D">Difan Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Ainslie%2C+M+D">Mark D. Ainslie</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Yunhua Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Dennis%2C+A+R">Anthony R. Dennis</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+K">Kaiyuan Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Hull%2C+J+R">John R. Hull</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">David A. Cardwell</a>, <a href="/search/cond-mat?searchtype=author&query=Durrell%2C+J+H">John H. Durrell</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="1701.00266v1-abstract-short" style="display: inline;"> A trapped magnetic field of greater than 3 T has been achieved in a single grain GdBa2Cu3O7-未 (GdBaCuO) bulk superconductor of diameter 30 mm by employing pulsed field magnetisation (PFM). The magnet system is portable and operates at temperatures between 50 K and 60 K. Flux jump behaviour was observed consistently during magnetisation when the applied pulsed field, Ba, exceeded a critical value (… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.00266v1-abstract-full').style.display = 'inline'; document.getElementById('1701.00266v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1701.00266v1-abstract-full" style="display: none;"> A trapped magnetic field of greater than 3 T has been achieved in a single grain GdBa2Cu3O7-未 (GdBaCuO) bulk superconductor of diameter 30 mm by employing pulsed field magnetisation (PFM). The magnet system is portable and operates at temperatures between 50 K and 60 K. Flux jump behaviour was observed consistently during magnetisation when the applied pulsed field, Ba, exceeded a critical value (e.g. 3.78 T at 60 K). A sharp dBa/dt is essential to this phenomenon. This flux jump behaviour enables the magnetic flux to penetrate fully to the centre of the bulk superconductor, resulting in full magnetization of the sample without requiring an applied field as large as that predicted by the Bean model. We show that this flux jump behaviour can occur over a wide range of fields and temperatures, and that it can be exploited in a practical quasi-permanent magnet system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.00266v1-abstract-full').style.display = 'none'; document.getElementById('1701.00266v1-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 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">8 pages, 4 figures. Accepted for publication in APL</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> APPLIED PHYSICS LETTERS 110, 062601 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1410.7973">arXiv:1410.7973</a> <span> [<a href="https://arxiv.org/pdf/1410.7973">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/10.1088/0953-2048/28/3/035014">10.1088/0953-2048/28/3/035014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A new seeding technique for the reliable fabrication of large, SmBCO single grains containing silver using top seeded melt growth </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Y-H Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Dennis%2C+A+R">A R Dennis</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D A Cardwell</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="1410.7973v1-abstract-short" style="display: inline;"> Silver (Ag) is an established additive for improving the mechanical properties of single grain, (RE)BCO bulk superconductors (where RE = Sm, Gd and Y). The presence of Ag in the (RE)BCO bulk composition, however, typically reduces the melting temperature of the single crystal seed in the top seeded melt growth (TSMG) process, which complicates significantly the controlled nucleation and subsequent… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.7973v1-abstract-full').style.display = 'inline'; document.getElementById('1410.7973v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1410.7973v1-abstract-full" style="display: none;"> Silver (Ag) is an established additive for improving the mechanical properties of single grain, (RE)BCO bulk superconductors (where RE = Sm, Gd and Y). The presence of Ag in the (RE)BCO bulk composition, however, typically reduces the melting temperature of the single crystal seed in the top seeded melt growth (TSMG) process, which complicates significantly the controlled nucleation and subsequent epitaxial growth of a single grain, which is essential for high field engineering applications. The reduced reliability of the seeding process in the presence of Ag is particularly acute for the SmBCO system, since the melting temperature of SmBCO is very close to that of the generic NdBCO(MgO) seed. SmBCO has the highest superconducting transition temperature, Tc, and exhibits the most pronounced "peak" effect at higher magnetic field of all materials in the family of (RE)BCO bulk superconductors and, therefore, has the greatest potential for use in practical applications (compared to GdBCO and YBCO, in particular). Development of an effective seeding process, therefore, is one of the major challenges of the TSMG process for the growth of large, high quantity single grain superconductors. In this paper, we report a novel technique that involves introducing a buffer layer between the seed crystal and the precursor pellet, primarily to inhibit the diffusion of Ag from the green body to the seed during melt processing in order to prevent the melting of the seed. The success rate of the seeding process using this technique is 100% for relatively small batch samples. The superconducting properties, Tc, Jc and trapped fields, of the single grains fabricated using the buffers are reported and the micro-structures in the vicinity of the buffer of single grains fabricated by the modified technique are analysed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.7973v1-abstract-full').style.display = 'none'; document.getElementById('1410.7973v1-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 October, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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, 10 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/1406.0686">arXiv:1406.0686</a> <span> [<a href="https://arxiv.org/pdf/1406.0686">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/10.1088/0953-2048/27/8/082001">10.1088/0953-2048/27/8/082001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Trapped Field of 17.6 T in Melt-Processed, Bulk Gd-Ba-Cu-O Reinforced with Shrink-Fit Steel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Durrell%2C+J+H">John H. Durrell</a>, <a href="/search/cond-mat?searchtype=author&query=Dennis%2C+A+R">Anthony R. Dennis</a>, <a href="/search/cond-mat?searchtype=author&query=Jaroszynski%2C+J">Jan Jaroszynski</a>, <a href="/search/cond-mat?searchtype=author&query=Ainslie%2C+M+D">Mark D. Ainslie</a>, <a href="/search/cond-mat?searchtype=author&query=Palmer%2C+K+G+B">Kysen G. B. Palmer</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Yunhua Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Campbell%2C+A+M">Archie M. Campbell</a>, <a href="/search/cond-mat?searchtype=author&query=Hull%2C+J">John Hull</a>, <a href="/search/cond-mat?searchtype=author&query=Strasik%2C+M">Mike Strasik</a>, <a href="/search/cond-mat?searchtype=author&query=Hellstrom%2C+E">Eric Hellstrom</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">David A. Cardwell</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="1406.0686v2-abstract-short" style="display: inline;"> The ability of large grain, REBa$_{2}$Cu$_{3}$O$_{7-未}$ [(RE)BCO; RE = rare earth] bulk superconductors to trap magnetic field is determined by their critical current. With high trapped fields, however, bulk samples are subject to a relatively large Lorentz force, and their performance is limited primarily by their tensile strength. Consequently, sample reinforcement is the key to performance impr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.0686v2-abstract-full').style.display = 'inline'; document.getElementById('1406.0686v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.0686v2-abstract-full" style="display: none;"> The ability of large grain, REBa$_{2}$Cu$_{3}$O$_{7-未}$ [(RE)BCO; RE = rare earth] bulk superconductors to trap magnetic field is determined by their critical current. With high trapped fields, however, bulk samples are subject to a relatively large Lorentz force, and their performance is limited primarily by their tensile strength. Consequently, sample reinforcement is the key to performance improvement in these technologically important materials. In this work, we report a trapped field of 17.6 T, the largest reported to date, in a stack of two, silver-doped GdBCO superconducting bulk samples, each of diameter 25 mm, fabricated by top-seeded melt growth (TSMG) and reinforced with shrink-fit stainless steel. This sample preparation technique has the advantage of being relatively straightforward and inexpensive to implement and offers the prospect of easy access to portable, high magnetic fields without any requirement for a sustaining current source. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.0686v2-abstract-full').style.display = 'none'; document.getElementById('1406.0686v2-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 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 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">Updated submission to reflect licence change to CC-BY. This is the "author accepted manuscript" and is identical in content to the published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Supercond. Sci. Technol. 27 082001 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1210.5429">arXiv:1210.5429</a> <span> [<a href="https://arxiv.org/pdf/1210.5429">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/10.1088/0953-2048/26/1/015012">10.1088/0953-2048/26/1/015012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> YBCO single grains seeded by 45掳 - 45掳 bridge-seeds of different lengths </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Yunhua Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Durrell%2C+J+H">John H. Durrell</a>, <a href="/search/cond-mat?searchtype=author&query=Dennis%2C+A+R">Anthony R. Dennis</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">David A. Cardwell</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="1210.5429v1-abstract-short" style="display: inline;"> Single grain, (RE)BCO bulk superconductors in large or complicated geometries are required for a variety of potential applications, such as motors and generators and magnetic shielding devices. As a result, top, multi-seeded, melt growth (TMSMG) has been investigated over the past two years in an attempt to enlarge the size of (RE)BCO single grains specifically for such applications. Of these mult… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.5429v1-abstract-full').style.display = 'inline'; document.getElementById('1210.5429v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1210.5429v1-abstract-full" style="display: none;"> Single grain, (RE)BCO bulk superconductors in large or complicated geometries are required for a variety of potential applications, such as motors and generators and magnetic shielding devices. As a result, top, multi-seeded, melt growth (TMSMG) has been investigated over the past two years in an attempt to enlarge the size of (RE)BCO single grains specifically for such applications. Of these multi-seeding techniques, so-called bridge seeding provides the best alignment of two seeds in a single grain growth process. Here we report, for the first time, the successful growth of YBCO using a special, 45掳 - 45掳, arrangement of bridge-seeds. The superconducting properties, including trapped field, of the multi-seeded YBCO grains have been measured for different bridge lengths of the 45掳- 45掳 bridge-seeds. The boundaries at the impinging growth front and the growth features of the top, multi-seeded surface and cross-section of the multi-seeded, samples have been analysed using optical microscopy. The results suggest that an impurity-free boundary between the two seeds of each leg of the bridge-seed can form when 45掳- 45掳 bridge-seeds are used to enlarge the size of YBCO grains. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.5429v1-abstract-full').style.display = 'none'; document.getElementById('1210.5429v1-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 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2012. </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 SUST on 27th September. 9 Pages, 6 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/1207.6982">arXiv:1207.6982</a> <span> [<a href="https://arxiv.org/pdf/1207.6982">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/10.1088/0953-2048/25/11/112002">10.1088/0953-2048/25/11/112002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Trapped Field of >3T in Bulk MgB2 Fabricated by Uniaxial Hot Pressing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Durrell%2C+J+H">J. H. Durrell</a>, <a href="/search/cond-mat?searchtype=author&query=Dancer%2C+C+E+J">C. E. J. Dancer</a>, <a href="/search/cond-mat?searchtype=author&query=Dennis%2C+A">A. Dennis</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Y. Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+Z">Z. Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Campbell%2C+A+M">A. M. Campbell</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N. H. Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Todd%2C+R+I">R. I. Todd</a>, <a href="/search/cond-mat?searchtype=author&query=Grovenor%2C+C+R+M">C. R. M. Grovenor</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D. A. Cardwell</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="1207.6982v3-abstract-short" style="display: inline;"> A trapped field of over 3 T has been measured at 17.5 K in a magnetised stack of two disc-shaped bulk MgB2 superconductors of diameter 25 mm and thickness 5.4 mm. The bulk MgB2 samples were fabricated by uniaxial hot pressing, which is a readily scalable, industrial technique, to 91% of their maximum theoretical density. The macroscopic critical current density derived from the trapped field data… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.6982v3-abstract-full').style.display = 'inline'; document.getElementById('1207.6982v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1207.6982v3-abstract-full" style="display: none;"> A trapped field of over 3 T has been measured at 17.5 K in a magnetised stack of two disc-shaped bulk MgB2 superconductors of diameter 25 mm and thickness 5.4 mm. The bulk MgB2 samples were fabricated by uniaxial hot pressing, which is a readily scalable, industrial technique, to 91% of their maximum theoretical density. The macroscopic critical current density derived from the trapped field data using the Biot-Savart law is consistent with the measured local critical current density. From this we conclude that critical current density, and therefore trapped field performance, is limited by the flux pinning available in MgB2, rather than by lack of connectivity. This suggests strongly that both increasing sample size and enhancing pinning through doping will allow further increases in trapped field performance of bulk MgB2. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.6982v3-abstract-full').style.display = 'none'; document.getElementById('1207.6982v3-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 September, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2012. </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. Accepted as a Rapid Publication in Superconductor Science and Technology (Final version after peer review)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Supercond. Sci. Technol. 25 112002 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1101.5934">arXiv:1101.5934</a> <span> [<a href="https://arxiv.org/pdf/1101.5934">pdf</a>, <a href="https://arxiv.org/ps/1101.5934">ps</a>, <a href="https://arxiv.org/format/1101.5934">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.84.104513">10.1103/PhysRevB.84.104513 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa2Cu3O6.9 studied by polarized neutron spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Headings%2C+N+S">N. S. Headings</a>, <a href="/search/cond-mat?searchtype=author&query=Hayden%2C+S+M">S. M. Hayden</a>, <a href="/search/cond-mat?searchtype=author&query=Kulda%2C+J">J. Kulda</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N. Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D. A. Cardwell</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="1101.5934v2-abstract-short" style="display: inline;"> We use inelastic neutron scattering with spin polarization analysis to study the magnetic excitations in the normal and superconducting states of YBa2Cu3O6.9. Polarization analysis allows us to determine the spin polarization of the magnetic excitations and to separate them from phonon scattering. In the normal state, we find unambiguous evidence of magnetic excitations over the 10-60meV range of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1101.5934v2-abstract-full').style.display = 'inline'; document.getElementById('1101.5934v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1101.5934v2-abstract-full" style="display: none;"> We use inelastic neutron scattering with spin polarization analysis to study the magnetic excitations in the normal and superconducting states of YBa2Cu3O6.9. Polarization analysis allows us to determine the spin polarization of the magnetic excitations and to separate them from phonon scattering. In the normal state, we find unambiguous evidence of magnetic excitations over the 10-60meV range of the experiment with little polarization dependence to the excitations. In the superconducting state, the magnetic response is enhanced near the "resonance energy" and above. At lower energies, 10<E<30meV, the local susceptibility becomes anisotropic, with the excitations polarized along the c-axis being suppressed. We find evidence for a new diffuse anisotropic response polarized perpendicular to the c-axis which may carry significant spectral weight. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1101.5934v2-abstract-full').style.display = 'none'; document.getElementById('1101.5934v2-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 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 January, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">Various typos and errors (inc assignment of components) corrected</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 84, 104513 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1006.4927">arXiv:1006.4927</a> <span> [<a href="https://arxiv.org/pdf/1006.4927">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/10.1063/1.3465301">10.1063/1.3465301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multi-seeded melt growth (MSMG) of bulk Y-Ba-Cu-O using thin-film seeds </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+T+Y">T. Y. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+C+L">C. L. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+L+J">L. J. Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+S+B">S. B. Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+L">L. Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+X">X. Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Xiong%2C+J">J. Xiong</a>, <a href="/search/cond-mat?searchtype=author&query=Tao%2C+B+W">B. W. Tao</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+J+Q">J. Q. Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+X+Y">X. Y. Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+C+S">C. S. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D. A. Cardwell</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="1006.4927v1-abstract-short" style="display: inline;"> Y-Ba-Cu-O (YBCO) and Sm-Ba-Cu-O (SmBCO) thin films have been used for the first time as heterogeneous seeds to multi-seed successfully the melt growth of bulk YBCO in a multi-seeded melt growth (MSMG) process. The use of thin film seeds, which may be prepared with highly controlled orientation (i.e. with a well-defined a-b plane and precisely known a-direction), is based on their superheating prop… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.4927v1-abstract-full').style.display = 'inline'; document.getElementById('1006.4927v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1006.4927v1-abstract-full" style="display: none;"> Y-Ba-Cu-O (YBCO) and Sm-Ba-Cu-O (SmBCO) thin films have been used for the first time as heterogeneous seeds to multi-seed successfully the melt growth of bulk YBCO in a multi-seeded melt growth (MSMG) process. The use of thin film seeds, which may be prepared with highly controlled orientation (i.e. with a well-defined a-b plane and precisely known a-direction), is based on their superheating properties and reduces significantly contamination of the bulk sample by the seed material. A variety of grain boundaries were obtained by varying the angle between the seeds. Microstructural studies indicate that the extent of residual melt deposited at the grain boundary decreases with increasing grain boundary contact angle. It is established that the growth front proceeds continuously at the (110)/(110) grain boundary without trapping liquid, which leads to the formation of a clean grain boundary. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.4927v1-abstract-full').style.display = 'none'; document.getElementById('1006.4927v1-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 June, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2010. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1005.1329">arXiv:1005.1329</a> <span> [<a href="https://arxiv.org/pdf/1005.1329">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/10.1088/0953-2048/23/7/075006">10.1088/0953-2048/23/7/075006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Vanderbemden%2C+P">P Vanderbemden</a>, <a href="/search/cond-mat?searchtype=author&query=Laurent%2C+P">P Laurent</a>, <a href="/search/cond-mat?searchtype=author&query=Fagnard%2C+J">J-F Fagnard</a>, <a href="/search/cond-mat?searchtype=author&query=Ausloos%2C+M">M Ausloos</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D A Cardwell</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="1005.1329v1-abstract-short" style="display: inline;"> In the present work we study, both theoretically and experimentally, the temperature increase in a bulk high-temperature superconductor subjected to applied AC magnetic fields of large amplitude. We calculate analytically the equilibrium temperatures of the bulk sample as a function of the experimental parameters using a simple critical-state model for an infinitely long type-II superconducting sl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1005.1329v1-abstract-full').style.display = 'inline'; document.getElementById('1005.1329v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1005.1329v1-abstract-full" style="display: none;"> In the present work we study, both theoretically and experimentally, the temperature increase in a bulk high-temperature superconductor subjected to applied AC magnetic fields of large amplitude. We calculate analytically the equilibrium temperatures of the bulk sample as a function of the experimental parameters using a simple critical-state model for an infinitely long type-II superconducting slab or cylinder. The results show the existence of a limit heat transfer coefficient (AUlim) separating two thermal regimes with different characteristics. The theoretical analysis predicts a "forbidden" temperature window within which the temperature of the superconductor can never stabilize when the heat transfer coefficient is small. In addition, we determine an analytical expression of two threshold fields Htr1 and Htr2 characterizing the importance of magneto-thermal effects and show that a thermal runaway always occurs when the field amplitude is larger than Htr2. The theoretical predictions of the temperature evolution of the bulk sample during a self-heating process agree well with the experimental data. The simple analytical study presented in this paper enables order of magnitude thermal effects to be estimated for simple superconductor geometries under applied AC magnetic fields and can be used to predict the influence of experimental parameters on the self-heating characteristics of bulk type-II superconductors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1005.1329v1-abstract-full').style.display = 'none'; document.getElementById('1005.1329v1-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 May, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2010. </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">32 pages, 6 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/0805.1285">arXiv:0805.1285</a> <span> [<a href="https://arxiv.org/pdf/0805.1285">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/10.1088/0957-0233/19/8/085705">10.1088/0957-0233/19/8/085705 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An AC susceptometer for the characterization of large, bulk superconducting samples </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Laurent%2C+P">P Laurent</a>, <a href="/search/cond-mat?searchtype=author&query=Fagnard%2C+J+F">J F Fagnard</a>, <a href="/search/cond-mat?searchtype=author&query=Vanderheyden%2C+B">B Vanderheyden</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D A Cardwell</a>, <a href="/search/cond-mat?searchtype=author&query=Ausloos%2C+M">M Ausloos</a>, <a href="/search/cond-mat?searchtype=author&query=Vanderbemden%2C+P">P Vanderbemden</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="0805.1285v1-abstract-short" style="display: inline;"> The main purpose of this work was to design, develop and construct a simple, low-cost AC susceptometer to measure large, bulk superconducting samples (up to 32 mm in diameter) in the temperature range 78-120 K. The design incorporates a double heating system that enables a high heating rate (25 K/hour) while maintaining a small temperature gradient (< 0.2 K) across the sample. The apparatus can… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.1285v1-abstract-full').style.display = 'inline'; document.getElementById('0805.1285v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0805.1285v1-abstract-full" style="display: none;"> The main purpose of this work was to design, develop and construct a simple, low-cost AC susceptometer to measure large, bulk superconducting samples (up to 32 mm in diameter) in the temperature range 78-120 K. The design incorporates a double heating system that enables a high heating rate (25 K/hour) while maintaining a small temperature gradient (< 0.2 K) across the sample. The apparatus can be calibrated precisely using a copper coil connected in series with the primary coil. The system has been used successfully to measure the temperature dependence of the AC magnetic properties of entire RE-Ba-Cu-O [(RE)BCO] bulk superconducting domains. A typical AC susceptibility measurement run from 78 K to 95 K takes about 2 hours, with excellent temperature resolution (temperature step ~ 4 mK) around the critical temperature, in particular. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.1285v1-abstract-full').style.display = 'none'; document.getElementById('0805.1285v1-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> 9 May, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">25 pages, 7 figures. Accepted for publication in Measurement Science and Technology</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/0703362">arXiv:cond-mat/0703362</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0703362">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/10.1088/0953-2048/20/9/S10">10.1088/0953-2048/20/9/S10 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Remagnetization of bulk high-temperature superconductors subjected to crossed and rotating magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Vanderbemden%2C+P">P Vanderbemden</a>, <a href="/search/cond-mat?searchtype=author&query=Hong%2C+Z">Z Hong</a>, <a href="/search/cond-mat?searchtype=author&query=Coombs%2C+T+A">T A Coombs</a>, <a href="/search/cond-mat?searchtype=author&query=Ausloos%2C+M">M Ausloos</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D A Cardwell</a>, <a href="/search/cond-mat?searchtype=author&query=Campbell%2C+A+M">A M Campbell</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/0703362v1-abstract-short" style="display: inline;"> Bulk melt-processed Y-Ba-Cu-O (YBCO) has significant potential for a variety of high field permanent magnet-like applications, such as the rotor of a brushless motor. When used in rotating devices of this kind, however, the YBCO can be subjected to both transient and alternating magnetic fields that are not parallel to the direction of magnetization and which have a detrimental effect on the tra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0703362v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0703362v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0703362v1-abstract-full" style="display: none;"> Bulk melt-processed Y-Ba-Cu-O (YBCO) has significant potential for a variety of high field permanent magnet-like applications, such as the rotor of a brushless motor. When used in rotating devices of this kind, however, the YBCO can be subjected to both transient and alternating magnetic fields that are not parallel to the direction of magnetization and which have a detrimental effect on the trapped field. These effects may lead to a long-term decay of the magnetization of the bulk sample. In the present work, we analyze both experimentally and numerically the remagnetization process of a melt-processed YBCO single domain that has been partially demagnetized by a magnetic field applied orthogonal to the initial direction of trapped flux. Magnetic torque measurements are used as a tool to probe changes in the remanent magnetization during various sequences of applied field. The application of a small magnetic field between the transverse cycles parallel to the direction of original magnetization results in partial remagnetization of the sample. Rotating the applied field, however, is found to be much more efficient at remagnetizing the bulk material than applying a magnetizing field pulse of the same amplitude. The principal features of the experimental data can be reproduced qualitatively using a two-dimensional finite-element numerical model based on an E-J power law. Finally, the remagnetization process is shown to result from the complex modification of current distribution within the cross-section of the bulk sample. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0703362v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0703362v1-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> 14 March, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2007. </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">23 pages, 9 figures, submitted</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/0703330">arXiv:cond-mat/0703330</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0703330">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/10.1103/PhysRevB.75.174515">10.1103/PhysRevB.75.174515 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Vanderbemden%2C+P">Ph. Vanderbemden</a>, <a href="/search/cond-mat?searchtype=author&query=Hong%2C+Z">Z. Hong</a>, <a href="/search/cond-mat?searchtype=author&query=Coombs%2C+T+A">T. A. Coombs</a>, <a href="/search/cond-mat?searchtype=author&query=Denis%2C+S">S. Denis</a>, <a href="/search/cond-mat?searchtype=author&query=Ausloos%2C+M">M. Ausloos</a>, <a href="/search/cond-mat?searchtype=author&query=Schwartz%2C+J">J. Schwartz</a>, <a href="/search/cond-mat?searchtype=author&query=Rutel%2C+I+B">I. B. Rutel</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N. Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D. A. Cardwell</a>, <a href="/search/cond-mat?searchtype=author&query=Campbell%2C+A+M">A. M. Campbell</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/0703330v2-abstract-short" style="display: inline;"> Crossed magnetic field effects on bulk high-temperature superconductors have been studied both experimentally and numerically. The sample geometry investigated involves finite-size effects along both (crossed) magnetic field directions. The experiments were carried out on bulk melt-processed Y-Ba-Cu-O (YBCO) single domains that had been pre-magnetized with the applied field parallel to their sho… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0703330v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0703330v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0703330v2-abstract-full" style="display: none;"> Crossed magnetic field effects on bulk high-temperature superconductors have been studied both experimentally and numerically. The sample geometry investigated involves finite-size effects along both (crossed) magnetic field directions. The experiments were carried out on bulk melt-processed Y-Ba-Cu-O (YBCO) single domains that had been pre-magnetized with the applied field parallel to their shortest direction (i.e. the c-axis) and then subjected to several cycles of the application of a transverse magnetic field parallel to the sample ab plane. The magnetic properties were measured using orthogonal pick-up coils, a Hall probe placed against the sample surface and Magneto-Optical Imaging (MOI). We show that all principal features of the experimental data can be reproduced qualitatively using a two-dimensional finite-element numerical model based on an E-J power law and in which the current density flows perpendicularly to the plane within which the two components of magnetic field are varied. The results of this study suggest that the suppression of the magnetic moment under the action of a transverse field can be predicted successfully by ignoring the existence of flux-free configurations or flux-cutting effects. These investigations show that the observed decay in magnetization results from the intricate modification of current distribution within the sample cross-section. It is also shown that the model does not predict any saturation of the magnetic induction, even after a large number (~ 100) of transverse field cycles. These features are shown to be consistent with the experimental data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0703330v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0703330v2-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> 10 May, 2007; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 March, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2007. </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">41 pages, 9 figures, accepted in Phys. Rev. B Changes : 8 references added, a few precisions added, some typos corrected</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/0112121">arXiv:cond-mat/0112121</a> <span> <a href="https://arxiv.org/format/cond-mat/0112121">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/10.1088/0953-2048/15/2/101">10.1088/0953-2048/15/2/101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron Irradiation of MgB2 Bulk Superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Eisterer%2C+M">M. Eisterer</a>, <a href="/search/cond-mat?searchtype=author&query=Zehetmayer%2C+M">M. Zehetmayer</a>, <a href="/search/cond-mat?searchtype=author&query=Toenies%2C+S">S. Toenies</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+H+W">H. W. Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Kambara%2C+M">M. Kambara</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N. Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D. A. Cardwell</a>, <a href="/search/cond-mat?searchtype=author&query=Greenwood%2C+L+R">L. R. Greenwood</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/0112121v1-abstract-short" style="display: inline;"> Sintered samples of MgB2 were irradiated in a fission reactor. Defects in the bulk microstructure are produced during this process mainly by the 10B(n,a)7Li reaction while collisions of fast neutrons with the lattice atoms induce much less damage. Self-shielding effects turn out to be very important and lead to a highly inhomogeneous defect distribution in the irradiated samples. The resulting d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0112121v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0112121v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0112121v1-abstract-full" style="display: none;"> Sintered samples of MgB2 were irradiated in a fission reactor. Defects in the bulk microstructure are produced during this process mainly by the 10B(n,a)7Li reaction while collisions of fast neutrons with the lattice atoms induce much less damage. Self-shielding effects turn out to be very important and lead to a highly inhomogeneous defect distribution in the irradiated samples. The resulting disorder enhances the normal state resistivity and the upper critical field. The irreversibility line shifts to higher fields at low temperatures and the measured critical current densities increase following irradiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0112121v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0112121v1-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 December, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2001. </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">to be published in Superconductos Science and Technology</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Supercond. Sci. Technol. 15 (2002) L9 </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/0106278">arXiv:cond-mat/0106278</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0106278">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/10.1063/1.1424070">10.1063/1.1424070 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Growth of Strongly Biaxially Aligned MgB2 Thin Films on Sapphire by Post-annealing of Amorphous Precursors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Berenov%2C+A">A. Berenov</a>, <a href="/search/cond-mat?searchtype=author&query=Lockman%2C+Z">Z. Lockman</a>, <a href="/search/cond-mat?searchtype=author&query=Qi%2C+X">X. Qi</a>, <a href="/search/cond-mat?searchtype=author&query=Bugoslavsky%2C+Y">Y. Bugoslavsky</a>, <a href="/search/cond-mat?searchtype=author&query=Cohen%2C+L+F">L. F. Cohen</a>, <a href="/search/cond-mat?searchtype=author&query=Jo%2C+M+-">M. -H. Jo</a>, <a href="/search/cond-mat?searchtype=author&query=Stelmashenko%2C+N+A">N. A. Stelmashenko</a>, <a href="/search/cond-mat?searchtype=author&query=Tsaneva%2C+V+N">V. N. Tsaneva</a>, <a href="/search/cond-mat?searchtype=author&query=Kambara%2C+M">M. Kambara</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N. Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D. A. Cardwell</a>, <a href="/search/cond-mat?searchtype=author&query=Blamire%2C+M+G">M. G. Blamire</a>, <a href="/search/cond-mat?searchtype=author&query=MacManus-Driscoll%2C+J+L">J. L. MacManus-Driscoll</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/0106278v1-abstract-short" style="display: inline;"> MgB2 thin films were cold-grown on sapphire substrates by pulsed laser deposition (PLD), followed by post-annealing in mixed, reducing gas, Mg-rich, Zr gettered, environments. The films had Tcs in the range 29 K to 34 K, Jcs (20K, H=0) in the range 30 kA/cm2 to 300 kA/cm2, and irreversibility fields at 20 K of 4 T to 6.2 T. An inverse correlation was found between Tc and irreversibility field. T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0106278v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0106278v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0106278v1-abstract-full" style="display: none;"> MgB2 thin films were cold-grown on sapphire substrates by pulsed laser deposition (PLD), followed by post-annealing in mixed, reducing gas, Mg-rich, Zr gettered, environments. The films had Tcs in the range 29 K to 34 K, Jcs (20K, H=0) in the range 30 kA/cm2 to 300 kA/cm2, and irreversibility fields at 20 K of 4 T to 6.2 T. An inverse correlation was found between Tc and irreversibility field. The films had grain sizes of 0.1-1 micron and a strong biaxial alignment was observed in the 950C annealed film. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0106278v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0106278v1-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> 14 June, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2001. </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, 5 figures, submitted to Applied Physics Letters</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/0104114">arXiv:cond-mat/0104114</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0104114">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/10.1063/1.1405807">10.1063/1.1405807 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for high inter-granular current flow in single-phase polycrystalline MgB2 superconductor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kawano%2C+K">K. Kawano</a>, <a href="/search/cond-mat?searchtype=author&query=Abell%2C+J+S">J. S. Abell</a>, <a href="/search/cond-mat?searchtype=author&query=Kambara%2C+M">M. Kambara</a>, <a href="/search/cond-mat?searchtype=author&query=Babu%2C+N+H">N Hari Babu</a>, <a href="/search/cond-mat?searchtype=author&query=Cardwell%2C+D+A">D. A. Cardwell</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/0104114v1-abstract-short" style="display: inline;"> The distribution of magnetic field in single-phase polycrystalline bulk MgB2 has been measured using a Magneto-Optical (MO) technique for an external magnetic field applied perpendicular to the sample surface. The MO studies indicate that an inter-granular current network is readily established in this material and the current is not limited by weak-linked grain boundaries. The grain boundaries… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0104114v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0104114v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0104114v1-abstract-full" style="display: none;"> The distribution of magnetic field in single-phase polycrystalline bulk MgB2 has been measured using a Magneto-Optical (MO) technique for an external magnetic field applied perpendicular to the sample surface. The MO studies indicate that an inter-granular current network is readily established in this material and the current is not limited by weak-linked grain boundaries. The grain boundaries are observed to resist preferential magnetic field penetration, with the inter-grain mechanism dominating the current flow in the sample at temperatures up to 30K. The results provide clear evidence that the intra-granular current flow is isotropic. A critical current density of ~10^4 Acm-2 was estimated at 30K in a field of 150mT from the MO measurements. These results provide further evidence of the considerable potential for MgB2 for engineering applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0104114v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0104114v1-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 April, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2001. </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">3 pages, 3 figures</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 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