{"id":335,"date":"2016-08-23T15:16:29","date_gmt":"2016-08-23T15:16:29","guid":{"rendered":"http:\/\/girsh.rutgers.edu\/?p=335"},"modified":"2018-09-13T19:26:18","modified_gmt":"2018-09-13T19:26:18","slug":"under-doping-to-over-doping","status":"publish","type":"post","link":"https:\/\/girsh.rutgers.edu\/index.php\/2016\/08\/23\/under-doping-to-over-doping\/","title":{"rendered":"Superconductivity and electronic fluctuations in Ba_{1\u2212x}K_{x}Fe_{2}As_{2} studied by Raman scattering"},"content":{"rendered":"<p style=\"text-align: left;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-341 alignright\" src=\"http:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2016\/08\/Fig-for-website-3.jpg\" width=\"240\" height=\"545\" \/><strong>Authors:<\/strong> S.-F. Wu, P. Richard, H. Ding, H.-H. Wen, Guotai Tan, Meng Wang, Chenglin Zhang, Pengcheng Dai, G. Blumberg<\/p>\n<p style=\"text-align: left;\"><strong>Abstract:<\/strong><\/p>\n<div data-canvas-width=\"233.529888\">Using polarization-resolved electronic Raman scattering we study underdoped, optimally doped, and overdoped Ba<sub>1\u2212x<\/sub>K<sub>x<\/sub>Fe<sub>2<\/sub>As<sub>2<\/sub> samples in the normal and superconducting states. We show that low-energy nematic fluctuations are universal for all studied doping ranges. In the superconducting state, we observe two distinct superconducting pair-breaking peaks corresponding to one large and one small superconducting gap. In addition, we detect a<br \/>\ncollective mode below the superconducting transition in the B<sub>2g<\/sub> channel and determine the evolution of its binding energy with doping. Possible scenarios are proposed to explain the origin of the in-gap collective mode. In the superconducting state of the underdoped regime, we detect a reentrance transition below which the spectral background changes and the collective mode vanishes.<\/div>\n<div data-canvas-width=\"233.529888\"><\/div>\n<ul>\n<li><em><a href=\"http:\/\/journals.aps.org\/prb\/abstract\/10.1103\/PhysRevB.95.085125\" target=\"_blank\"><em>Phys. Rev. B<\/em> <strong>95<\/strong>, 085125 (2017)<\/a>\u00a0<\/em>(<a href=\"http:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2016\/08\/Wu2017_PhysRevB.95.085125.pdf\" target=\"_blank\">PDF<\/a>)<\/li>\n<li><em><a href=\"http:\/\/arxiv.org\/abs\/1608.06064\" target=\"_blank\">Read arXiv e-print here<\/a>\u00a0<\/em>(<a href=\"http:\/\/girsh.rutgers.edu\/wp-content\/uploads\/2016\/08\/1608.06064v1-1.pdf\" target=\"_blank\">PDF<\/a>)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Authors: S.-F. Wu, P. Richard, H. Ding, H.-H. Wen, Guotai Tan, Meng Wang, Chenglin Zhang, Pengcheng Dai, G. Blumberg Abstract: Using polarization-resolved electronic Raman scattering we study underdoped, optimally doped, and overdoped Ba1\u2212xKxFe2As2 samples in the normal and superconducting states. We show that low-energy nematic fluctuations are universal for all studied doping ranges. In the &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/girsh.rutgers.edu\/index.php\/2016\/08\/23\/under-doping-to-over-doping\/\"> <span class=\"screen-reader-text\">Superconductivity and electronic fluctuations in Ba_{1\u2212x}K_{x}Fe_{2}As_{2} studied by Raman scattering<\/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\/335"}],"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=335"}],"version-history":[{"count":8,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/posts\/335\/revisions"}],"predecessor-version":[{"id":797,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/posts\/335\/revisions\/797"}],"wp:attachment":[{"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/media?parent=335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/categories?post=335"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/girsh.rutgers.edu\/index.php\/wp-json\/wp\/v2\/tags?post=335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}