{"id":9247,"date":"2020-11-04T15:26:00","date_gmt":"2020-11-04T13:26:00","guid":{"rendered":"https:\/\/lncmi.cnrs.fr\/?p=9247"},"modified":"2025-07-07T14:08:24","modified_gmt":"2025-07-07T12:08:24","slug":"record-upper-critical-field-in-c-doped-bulk-mgb2","status":"publish","type":"post","link":"https:\/\/lncmi.cnrs.fr\/en\/news\/record-upper-critical-field-in-c-doped-bulk-mgb2\/","title":{"rendered":"Record upper critical field in C-doped bulk MgB2"},"content":{"rendered":"\n<p>Researchers from the University of Geneva took advantage of the LNCMI 35 T DC resistive magnet in order to set a new record upper critical field <em>H<\/em><sub>c2<\/sub> in bulk MgB<sub>2<\/sub> doped with carbon. MgB<sub>2<\/sub> is currently used in practical applications for electrical power transport and magnetic field generation. For such applications, the upper critical field <em>H<\/em><sub>c2<\/sub>, that sets the limit for superconductivity, must be maximized. The full potential of MgB<sub>2<\/sub> remains to be unleashed, as indicated by large upper critical fields measured in thin films. To unlock this potential, the team devised an experimental plan in order to explore the vast parameter space of bulk MgB<sub>2-x<\/sub>C<sub>x<\/sub> synthesis. The samples were characterized and their resistivities have been measured at the LNCMI in order to determine what synthesis conditions yield the highest <em>H<\/em><sub>c2<\/sub>. This work shows that <em>H<\/em><sub>c2<\/sub> in bulk C-doped MgB<sub>2<\/sub> is bounded to a maximum value of 35 T at 4.2 K.<\/p>\n\n\n\n<p><strong>Publication &#8211;<\/strong> High\u2011field superconductivity in C\u2011doped MgB<sub>2<\/sub> bulk samples prepared by a rapid synthesis route &#8211; D. Matera, M. Bonura, R. \u010cern\u00fd, S. McKeown Walker, F. Buta, D. LeBoeuf, X. Chaud, E. Giannini &amp; C. Senatore, <a href=\"https:\/\/doi.org\/10.1038\/s41598-020-74300-9\">Scientific Reports <strong>10<\/strong> 17656 (2020)<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"943\" height=\"572\" src=\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2020\/11\/Actu41120.png\" alt=\"\" class=\"wp-image-23372\" srcset=\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2020\/11\/Actu41120.png 943w, https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2020\/11\/Actu41120-480x291.png 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 943px, 100vw\" \/><\/figure>\n\n\n\n<p><strong>Figure<\/strong> <strong>\u2013<\/strong> Resistance of a C-doped MgB<sub>2<\/sub> sample as a function of magnetic field measured at different temperatures. Upon increasing magnetic field, the superconducting state, indicated by zero resistance, is suppressed and the normal state resistance <em>R<\/em><sub>N<\/sub> is restored above <em>H<\/em><sub>c2<\/sub>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Researchers from the University of Geneva took advantage of the LNCMI 35 T DC resistive magnet in order to set a new record upper critical field Hc2 in bulk MgB2 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":23372,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[292],"tags":[],"post_folder":[],"class_list":["post-9247","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"jetpack_featured_media_url":"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2020\/11\/Actu41120.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/9247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/comments?post=9247"}],"version-history":[{"count":0,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/9247\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media\/23372"}],"wp:attachment":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media?parent=9247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/categories?post=9247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/tags?post=9247"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/post_folder?post=9247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}