{"id":1980,"date":"2018-12-10T23:52:49","date_gmt":"2018-12-10T23:52:49","guid":{"rendered":"http:\/\/blogs.kent.ac.uk\/strongcorrelations\/?p=1980"},"modified":"2018-12-25T09:20:06","modified_gmt":"2018-12-25T09:20:06","slug":"time-reversal-symmetry-breaking-in-re-based-superconductors","status":"publish","type":"post","link":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/","title":{"rendered":"Time-reversal symmetry breaking in Re-based superconductors"},"content":{"rendered":"<ul class=\"kent-social-links\"><li><a href='http:\/\/www.facebook.com\/sharer.php?u=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/&amp;t=Time-reversal symmetry breaking in Re-based superconductors' target='_blank'><i class='ksocial-facebook' title='Share via Facebook'><\/i><\/a><\/li><li><a href='http:\/\/twitter.com\/home?status=Time-reversal symmetry breaking in Re-based superconductors%20https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/' target='_blank'><i class='ksocial-twitter' title='Share via Twitter'><\/i><\/a><\/li><li><a href='https:\/\/plus.google.com\/share?url=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/' target='_blank'><i class='ksocial-google-plus' title='Share via Google Plus'><\/i><\/a><\/li><li><a href='http:\/\/linkedin.com\/shareArticle?mini=true&amp;url=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/&amp;title=Time-reversal symmetry breaking in Re-based superconductors' target='_blank'><i class='ksocial-linkedin' title='Share via Linked In'><\/i><\/a><\/li><li><a href='mailto:content=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/&amp;title=Time-reversal symmetry breaking in Re-based superconductors' target='_blank'><i class='ksocial-email' title='Share via Email'><\/i><\/a><\/li><\/ul><div>\n<div class=\"\">\n<div><span style=\"color: #ff0000\">Note added: this is now in print as <em>Phys. Rev. Lett. <\/em><strong>121<\/strong>, 257002 \u2013 Published 21 December 2018. DOI: <a style=\"color: #ff0000\" href=\"https:\/\/doi.org\/10.1103\/PhysRevLett.121.257002\">https:\/\/doi.org\/10.1103\/PhysRevLett.121.257002<\/a>.<\/span><\/div>\n<div><\/div>\n<div class=\"_1mf _1mj\">In our recent pre-print we present experimental data and theoretical analysis relating to the superconducting state of two Re-based superconductors, including pure Rhenium. The data supports time-reversal symmetry breaking in these compounds and suggests that there is something special about the electronic structure of Re that leads to the observed phenomenon \u2013 though our understanding is at present very primitive.<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"_1mf _1mj\"><\/div>\n<\/div>\n<div class=\"\">\n<div class=\"_1mf _1mj\">Incidentally, this is the largest collaboration I have been involved in so far \u2013 the paper has 18 authors from 13 institutions across Switzerland, China, the UK, Taiwan and India! It has been accepted for publication in Physical Review Letters (the preprint version includes the Supplemental Material as an Appendix).<\/div>\n<\/div>\n<\/div>\n<h1 class=\"title mathjax\">Time-reversal symmetry breaking in Re-based superconductors<\/h1>\n<div class=\"authors\"><a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Shang%2C+T\">T. Shang<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Smidman%2C+M\">M. Smidman<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Ghosh%2C+S+K\">S. K. Ghosh<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Baines%2C+C\">C. Baines<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Chang%2C+L+J\">L. J. Chang<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Gawryluk%2C+D+J\">D. J. Gawryluk<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Barker%2C+J+A+T\">J. A. T. Barker<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Singh%2C+R+P\">R. P. Singh<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Paul%2C+D+M\">D. Mck. Paul<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=.Balakrishnan%2C+G\">G .Balakrishnan<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Pomjakushina%2C+E\">E. Pomjakushina<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Shi%2C+M\">M. Shi<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Medarde%2C+M\">M. Medarde<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Hillier%2C+A+D\">A. D. Hillier<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Yuan%2C+H+Q\">H. Q. Yuan<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Quintanilla%2C+J\">J. Quintanilla<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Mesot%2C+J\">J. Mesot<\/a>, <a href=\"https:\/\/arxiv.org\/search\/cond-mat?searchtype=author&amp;query=Shiroka%2C+T\">T. Shiroka<\/a><\/div>\n<div class=\"dateline\">(Submitted on 28 Nov 2018 (<a href=\"https:\/\/arxiv.org\/abs\/1811.11793v1\">v1<\/a>), last revised 5 Dec 2018 (this version, v2))<\/div>\n<blockquote class=\"abstract mathjax\"><p>To trace the origin of time-reversal symmetry breaking (TRSB) in Re-based superconductors, we performed comparative muon-spin rotation\/relaxation (<span id=\"MathJax-Element-1-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-1\" class=\"math\"><span id=\"MathJax-Span-2\" class=\"mrow\"><span id=\"MathJax-Span-3\" class=\"texatom\"><span id=\"MathJax-Span-4\" class=\"mrow\"><span id=\"MathJax-Span-5\" class=\"mo\">\u03bc<\/span><\/span><\/span><\/span><\/span><\/span>SR) studies of superconducting noncentrosymmetric Re<span id=\"MathJax-Element-2-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-6\" class=\"math\"><span id=\"MathJax-Span-7\" class=\"mrow\"><span id=\"MathJax-Span-8\" class=\"msubsup\"><span id=\"MathJax-Span-9\" class=\"mi\"><\/span><span id=\"MathJax-Span-10\" class=\"texatom\"><span id=\"MathJax-Span-11\" class=\"mrow\"><span id=\"MathJax-Span-12\" class=\"mn\">0.82<\/span><\/span><\/span><\/span><\/span><\/span><\/span>Nb<span id=\"MathJax-Element-3-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-13\" class=\"math\"><span id=\"MathJax-Span-14\" class=\"mrow\"><span id=\"MathJax-Span-15\" class=\"msubsup\"><span id=\"MathJax-Span-16\" class=\"mi\"><\/span><span id=\"MathJax-Span-17\" class=\"texatom\"><span id=\"MathJax-Span-18\" class=\"mrow\"><span id=\"MathJax-Span-19\" class=\"mn\">0.18<\/span><\/span><\/span><\/span><\/span><\/span><\/span> (<span id=\"MathJax-Element-4-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-20\" class=\"math\"><span id=\"MathJax-Span-21\" class=\"mrow\"><span id=\"MathJax-Span-22\" class=\"msubsup\"><span id=\"MathJax-Span-23\" class=\"mi\">T<\/span><span id=\"MathJax-Span-24\" class=\"mi\">c<\/span><\/span><span id=\"MathJax-Span-25\" class=\"mo\">=<\/span><span id=\"MathJax-Span-26\" class=\"mn\">8.8<\/span><\/span><\/span><\/span> K) and centrosymmetric Re (<span id=\"MathJax-Element-5-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-27\" class=\"math\"><span id=\"MathJax-Span-28\" class=\"mrow\"><span id=\"MathJax-Span-29\" class=\"msubsup\"><span id=\"MathJax-Span-30\" class=\"mi\">T<\/span><span id=\"MathJax-Span-31\" class=\"mi\">c<\/span><\/span><span id=\"MathJax-Span-32\" class=\"mo\">=<\/span><span id=\"MathJax-Span-33\" class=\"mn\">2.7<\/span><\/span><\/span><\/span> K). In Re<span id=\"MathJax-Element-6-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-34\" class=\"math\"><span id=\"MathJax-Span-35\" class=\"mrow\"><span id=\"MathJax-Span-36\" class=\"msubsup\"><span id=\"MathJax-Span-37\" class=\"mi\"><\/span><span id=\"MathJax-Span-38\" class=\"texatom\"><span id=\"MathJax-Span-39\" class=\"mrow\"><span id=\"MathJax-Span-40\" class=\"mn\">0.82<\/span><\/span><\/span><\/span><\/span><\/span><\/span>Nb<span id=\"MathJax-Element-7-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-41\" class=\"math\"><span id=\"MathJax-Span-42\" class=\"mrow\"><span id=\"MathJax-Span-43\" class=\"msubsup\"><span id=\"MathJax-Span-44\" class=\"mi\"><\/span><span id=\"MathJax-Span-45\" class=\"texatom\"><span id=\"MathJax-Span-46\" class=\"mrow\"><span id=\"MathJax-Span-47\" class=\"mn\">0.18<\/span><\/span><\/span><\/span><\/span><\/span><\/span>, the low temperature superfluid density and the electronic specific heat evidence a fully-gapped superconducting state, whose enhanced gap magnitude and specific-heat discontinuity suggest a moderately strong electron-phonon coupling. In both Re<span id=\"MathJax-Element-8-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-48\" class=\"math\"><span id=\"MathJax-Span-49\" class=\"mrow\"><span id=\"MathJax-Span-50\" class=\"msubsup\"><span id=\"MathJax-Span-51\" class=\"mi\"><\/span><span id=\"MathJax-Span-52\" class=\"texatom\"><span id=\"MathJax-Span-53\" class=\"mrow\"><span id=\"MathJax-Span-54\" class=\"mn\">0.82<\/span><\/span><\/span><\/span><\/span><\/span><\/span>Nb<span id=\"MathJax-Element-9-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-55\" class=\"math\"><span id=\"MathJax-Span-56\" class=\"mrow\"><span id=\"MathJax-Span-57\" class=\"msubsup\"><span id=\"MathJax-Span-58\" class=\"mi\"><\/span><span id=\"MathJax-Span-59\" class=\"texatom\"><span id=\"MathJax-Span-60\" class=\"mrow\"><span id=\"MathJax-Span-61\" class=\"mn\">0.18<\/span><\/span><\/span><\/span><\/span><\/span><\/span> and pure Re, the spontaneous magnetic fields revealed by zero-field <span id=\"MathJax-Element-10-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-62\" class=\"math\"><span id=\"MathJax-Span-63\" class=\"mrow\"><span id=\"MathJax-Span-64\" class=\"texatom\"><span id=\"MathJax-Span-65\" class=\"mrow\"><span id=\"MathJax-Span-66\" class=\"mo\">\u03bc<\/span><\/span><\/span><\/span><\/span><\/span>SR below <span id=\"MathJax-Element-11-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-67\" class=\"math\"><span id=\"MathJax-Span-68\" class=\"mrow\"><span id=\"MathJax-Span-69\" class=\"msubsup\"><span id=\"MathJax-Span-70\" class=\"mi\">T<\/span><span id=\"MathJax-Span-71\" class=\"mi\">c<\/span><\/span><\/span><\/span><\/span> indicate time-reversal symmetry breaking and thus unconventional superconductivity. The concomitant occurrence of TRSB in centrosymmetric Re and noncentrosymmetric Re<span id=\"MathJax-Element-12-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-72\" class=\"math\"><span id=\"MathJax-Span-73\" class=\"mrow\"><span id=\"MathJax-Span-74\" class=\"mi\">T<\/span><\/span><\/span><\/span> (<span id=\"MathJax-Element-13-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-75\" class=\"math\"><span id=\"MathJax-Span-76\" class=\"mrow\"><span id=\"MathJax-Span-77\" class=\"mi\">T<\/span><\/span><\/span><\/span> = transition metal), yet its preservation in the isostructural noncentrosymmetric superconductors Mg<span id=\"MathJax-Element-14-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-78\" class=\"math\"><span id=\"MathJax-Span-79\" class=\"mrow\"><span id=\"MathJax-Span-80\" class=\"msubsup\"><span id=\"MathJax-Span-81\" class=\"mi\"><\/span><span id=\"MathJax-Span-82\" class=\"texatom\"><span id=\"MathJax-Span-83\" class=\"mrow\"><span id=\"MathJax-Span-84\" class=\"mn\">10<\/span><\/span><\/span><\/span><\/span><\/span><\/span>Ir<span id=\"MathJax-Element-15-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-85\" class=\"math\"><span id=\"MathJax-Span-86\" class=\"mrow\"><span id=\"MathJax-Span-87\" class=\"msubsup\"><span id=\"MathJax-Span-88\" class=\"mi\"><\/span><span id=\"MathJax-Span-89\" class=\"texatom\"><span id=\"MathJax-Span-90\" class=\"mrow\"><span id=\"MathJax-Span-91\" class=\"mn\">19<\/span><\/span><\/span><\/span><\/span><\/span><\/span>B<span id=\"MathJax-Element-16-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-92\" class=\"math\"><span id=\"MathJax-Span-93\" class=\"mrow\"><span id=\"MathJax-Span-94\" class=\"msubsup\"><span id=\"MathJax-Span-95\" class=\"mi\"><\/span><span id=\"MathJax-Span-96\" class=\"texatom\"><span id=\"MathJax-Span-97\" class=\"mrow\"><span id=\"MathJax-Span-98\" class=\"mn\">16<\/span><\/span><\/span><\/span><\/span><\/span><\/span> and Nb<span id=\"MathJax-Element-17-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-99\" class=\"math\"><span id=\"MathJax-Span-100\" class=\"mrow\"><span id=\"MathJax-Span-101\" class=\"msubsup\"><span id=\"MathJax-Span-102\" class=\"mi\"><\/span><span id=\"MathJax-Span-103\" class=\"texatom\"><span id=\"MathJax-Span-104\" class=\"mrow\"><span id=\"MathJax-Span-105\" class=\"mn\">0.5<\/span><\/span><\/span><\/span><\/span><\/span><\/span>Os<span id=\"MathJax-Element-18-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-106\" class=\"math\"><span id=\"MathJax-Span-107\" class=\"mrow\"><span id=\"MathJax-Span-108\" class=\"msubsup\"><span id=\"MathJax-Span-109\" class=\"mi\"><\/span><span id=\"MathJax-Span-110\" class=\"texatom\"><span id=\"MathJax-Span-111\" class=\"mrow\"><span id=\"MathJax-Span-112\" class=\"mn\">0.5<\/span><\/span><\/span><\/span><\/span><\/span><\/span>, strongly suggests that the local electronic structure of Re is crucial for understanding the TRSB superconducting state in Re and Re<span id=\"MathJax-Element-19-Frame\" class=\"MathJax\"><span id=\"MathJax-Span-113\" class=\"math\"><span id=\"MathJax-Span-114\" class=\"mrow\"><span id=\"MathJax-Span-115\" class=\"mi\">T<\/span><\/span><\/span><\/span>. We discuss the superconducting order parameter symmetries that are compatible with the observations.<\/p><\/blockquote>\n<div class=\"metatable\">\n<table summary=\"Additional metadata\">\n<tbody>\n<tr>\n<td class=\"tablecell label\">Comments:<\/td>\n<td class=\"tablecell comments mathjax\">3 figures, 5 pages, accepted by Physical Review Letters<\/td>\n<\/tr>\n<tr>\n<td class=\"tablecell label\">Subjects:<\/td>\n<td class=\"tablecell subjects\"><span class=\"primary-subject\">Superconductivity (cond-mat.supr-con)<\/span><\/td>\n<\/tr>\n<tr>\n<td class=\"tablecell label\">Cite as:<\/td>\n<td class=\"tablecell arxivid\"><a href=\"https:\/\/arxiv.org\/abs\/1811.11793\">arXiv:1811.11793<\/a> [cond-mat.supr-con]<\/td>\n<\/tr>\n<tr>\n<td class=\"tablecell label\"><\/td>\n<td class=\"tablecell arxividv\">(or <span class=\"arxivid\"> <a href=\"https:\/\/arxiv.org\/abs\/1811.11793v2\">arXiv:1811.11793v2<\/a> [cond-mat.supr-con]<\/span> for this version)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"kent-social-links\"><li><a href='http:\/\/www.facebook.com\/sharer.php?u=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/&amp;t=Time-reversal symmetry breaking in Re-based superconductors' target='_blank'><i class='ksocial-facebook' title='Share via Facebook'><\/i><\/a><\/li><li><a href='http:\/\/twitter.com\/home?status=Time-reversal symmetry breaking in Re-based superconductors%20https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/' target='_blank'><i class='ksocial-twitter' title='Share via Twitter'><\/i><\/a><\/li><li><a href='https:\/\/plus.google.com\/share?url=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/' target='_blank'><i class='ksocial-google-plus' title='Share via Google Plus'><\/i><\/a><\/li><li><a href='http:\/\/linkedin.com\/shareArticle?mini=true&amp;url=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/&amp;title=Time-reversal symmetry breaking in Re-based superconductors' target='_blank'><i class='ksocial-linkedin' title='Share via Linked In'><\/i><\/a><\/li><li><a href='mailto:content=https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/&amp;title=Time-reversal symmetry breaking in Re-based superconductors' target='_blank'><i class='ksocial-email' title='Share via Email'><\/i><\/a><\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>Note added: this is now in print as Phys. Rev. Lett. 121, 257002 \u2013 Published 21 December 2018. DOI: https:\/\/doi.org\/10.1103\/PhysRevLett.121.257002. In our recent pre-print we &hellip; <a href=\"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/2018\/12\/10\/time-reversal-symmetry-breaking-in-re-based-superconductors\/\">Read&nbsp;more<\/a><\/p>\n","protected":false},"author":976,"featured_media":1981,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[597],"tags":[194441,54572,194440,194439,54560,194429],"_links":{"self":[{"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/posts\/1980"}],"collection":[{"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/users\/976"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/comments?post=1980"}],"version-history":[{"count":7,"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/posts\/1980\/revisions"}],"predecessor-version":[{"id":1992,"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/posts\/1980\/revisions\/1992"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/media\/1981"}],"wp:attachment":[{"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/media?parent=1980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/categories?post=1980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/strongcorrelations\/wp-json\/wp\/v2\/tags?post=1980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}