{"id":624,"date":"2017-12-19T03:20:48","date_gmt":"2017-12-19T03:20:48","guid":{"rendered":"http:\/\/girsh.rutgers.edu\/?p=624"},"modified":"2017-12-19T03:20:48","modified_gmt":"2017-12-19T03:20:48","slug":"on-the-origin-of-critical-nematic-fluctuations-in-pnictide-superconductors","status":"publish","type":"post","link":"https:\/\/girsh.rutgers.edu\/index.php\/2017\/12\/19\/on-the-origin-of-critical-nematic-fluctuations-in-pnictide-superconductors\/","title":{"rendered":"On the origin of critical nematic fluctuations in pnictide superconductors"},"content":{"rendered":"<p><strong>Authors:\u00a0<\/strong>\u00a0S.-F. Wu, W.-L. Zhang, L. Li, H. B. Cao, H.-H. Kung, A. S. Sefat, H. Ding, P. Richard, and G. Blumberg<\/p>\n<p><strong>Abstract:\u00a0<\/strong><br \/>\n<img fetchpriority=\"high\" decoding=\"async\" class=\"alignright size-large wp-image-625\" src=\"http:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2017\/12\/Fig-1712.06066-300x217.png\" alt=\"Fig 1712.06066\" width=\"400\" height=\"289\" srcset=\"https:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2017\/12\/Fig-1712.06066-300x217.png 300w, https:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2017\/12\/Fig-1712.06066-768x555.png 768w, https:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2017\/12\/Fig-1712.06066-1024x740.png 1024w, https:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2017\/12\/Fig-1712.06066-960x694.png 960w, https:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2017\/12\/Fig-1712.06066.png 1722w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><br \/>\nWe employ polarization-resolved Raman spectroscopy to study critical nematic fluctuations in Ba(Fe<sub>1-x<\/sub>Au<sub>x<\/sub>)<sub>2<\/sub>As<sub>2<\/sub> superconductors above and across well separated tetragonal to\u00a0orthorhombic phase transition at temperature T<sub>S<\/sub>(x) and the Neel transition at T<sub>N<\/sub>(x). The static Raman susceptibility in XY symmetry channel increases upon cooling from room temperature following the Curie Weiss law, with Weiss temperature T<sub>\u03b8<\/sub>(x) several tens of degrees lower than T<sub>S<\/sub>(x). Data reveals a hidden nematic quantum critical point at x = 0.031 when the system becomes superconducting, indicating a direct connection between quantum critical nematic fluctuations and unconventional superconductivity. We attribute the origin of the nematicity to charge quadrupole fluctuations due to electron transfer between the nearly degenerate d<sub>xz<\/sub>\/d<sub>yz<\/sub> orbitals.<\/p>\n<ul>\n<li><em><a href=\"http:\/\/arxiv.org\/abs\/1712.06066\" target=\"_blank\">Read arXiv preprint<\/a><\/em><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Authors:\u00a0\u00a0S.-F. Wu, W.-L. Zhang, L. Li, H. B. Cao, H.-H. Kung, A. S. Sefat, H. Ding, P. Richard, and G. Blumberg Abstract:\u00a0 We employ polarization-resolved Raman spectroscopy to study critical nematic fluctuations in Ba(Fe1-xAux)2As2 superconductors above and across well separated tetragonal to\u00a0orthorhombic phase transition at temperature TS(x) and the Neel transition at TN(x). The static &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/girsh.rutgers.edu\/index.php\/2017\/12\/19\/on-the-origin-of-critical-nematic-fluctuations-in-pnictide-superconductors\/\"> <span class=\"screen-reader-text\">On the origin of critical nematic fluctuations in pnictide superconductors<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/posts\/624"}],"collection":[{"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/comments?post=624"}],"version-history":[{"count":9,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/posts\/624\/revisions"}],"predecessor-version":[{"id":634,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/posts\/624\/revisions\/634"}],"wp:attachment":[{"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/media?parent=624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/categories?post=624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/tags?post=624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}