{"id":1920,"date":"2015-07-05T22:55:30","date_gmt":"2015-07-06T05:55:30","guid":{"rendered":"http:\/\/physikon.net\/?p=1920"},"modified":"2022-06-22T09:50:29","modified_gmt":"2022-06-22T16:50:29","slug":"1920","status":"publish","type":"post","link":"http:\/\/physikon.net\/?p=1920","title":{"rendered":"Theory of High-T<sub>c<\/sub> Superconductivity: Accurate predictions of T<sub>C<\/sub>"},"content":{"rendered":"<p><!--more--><\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>Theory of High-<em>T<\/em><sub>C<\/sub> Superconductivity: Accurate Predictions of T<sub>C<\/sub><\/strong>, D. R. Harshman and A. T. Fiory [<a href=\"https:\/\/doi.org\/10.48550\/arXiv.1202.2480\">arXiv<\/a>]\n<p style=\"text-align: justify;\">The superconducting transition temperatures of high-<em>T<\/em><sub>C<\/sub> compounds based on copper, iron, ruthenium and certain organic molecules are discovered to be dependent on bond lengths, ionic valences, and Coulomb coupling between electronic bands in adjacent, spatially separated layers [1]. Optimal transition temperature, denoted as <em>T<\/em><sub>C0<\/sub>, is given by the universal expression k<sub>B<\/sub><em>T<\/em><sub>C0<\/sub> = <em>e<\/em><sup>2<\/sup>\u039b\/\u2113\u03b6; \u2113 is the spacing between interacting charges within the layers, \u03b6 is the distance between interacting layers and \u039b is a universal constant, equal to about twice the reduced electron Compton wavelength (suggesting that Compton scattering plays a role in pairing). Non-optimum compounds in which sample degradation is evident typically exhibit <em>T<\/em><sub>C<\/sub> &lt; <em>T<\/em><sub>C0<\/sub>. For the 31+ optimum compounds tested, the theoretical and experimental <em>T<\/em><sub>C0<\/sub> agree statistically to within \u00b11.4 K. The elemental high <em>T<\/em><sub>C<\/sub> building block comprises two adjacent and spatially separated charge layers; the factor <em>e<\/em><sup>2<\/sup>\/\u03b6 arises from Coulomb forces between them. The theoretical charge structure representing a room-temperature superconductor is also presented.<\/p>\n<p style=\"text-align: justify;\">[1] Dale R. Harshman, Anthony T. Fiory and John D. Dow, <a href=\"https:\/\/doi.org\/10.1088\/0953-8984\/23\/29\/295701\">J. Phys.: Condens. Matter <b>23<\/b>, 295701 (2011)<\/a><span style=\"color: initial;\">;\u00a0<\/span><a href=\"http:\/\/iopscience.iop.org\/0953-8984\/23\/34\/349501\/\"><b>23<\/b> 349501 (2011)<\/a><span style=\"color: initial;\">.<\/span><\/p>\n<p style=\"text-align: justify;\">\n<table id=\"tablepress-15\" class=\"tablepress tablepress-id-15\">\n<tbody class=\"row-hover\">\n<tr class=\"row-1\">\n\t<td class=\"column-1\"><a href=\"http:\/\/physikon.net\/wp-content\/uploads\/2015\/05\/APS_fig1.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/physikon.net\/wp-content\/uploads\/2015\/05\/APS_fig1-300x262.jpg\" alt=\"APS_fig1\" width=\"300\" height=\"262\" class=\"alignright size-medium wp-image-1418\" srcset=\"http:\/\/physikon.net\/wp-content\/uploads\/2015\/05\/APS_fig1-300x262.jpg 300w, http:\/\/physikon.net\/wp-content\/uploads\/2015\/05\/APS_fig1-1024x894.jpg 1024w, http:\/\/physikon.net\/wp-content\/uploads\/2015\/05\/APS_fig1-172x150.jpg 172w, http:\/\/physikon.net\/wp-content\/uploads\/2015\/05\/APS_fig1-150x131.jpg 150w, http:\/\/physikon.net\/wp-content\/uploads\/2015\/05\/APS_fig1.jpg 1840w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><br \/>\n<p align=\"justify\">The theoretical transition temperature <em>T<\/em><sub>C0<\/sub> (solid line) plotted against the experimental value for cuprate, Fe-based pnictide and chalcogenide, ruthenate and organic superconductors.<\/p><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-15 from cache -->\n<p>D. R. Harshman and A. T. Fiory, <a href=\"http:\/\/meetings.aps.org\/Meeting\/MAR12\/Event\/162303\">Abstract, APS March Meeting (2012)<\/a>.<\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":1418,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,8],"tags":[],"class_list":["post-1920","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-high-tc-superconductivity","category-high-tc-theory"],"_links":{"self":[{"href":"http:\/\/physikon.net\/index.php?rest_route=\/wp\/v2\/posts\/1920","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/physikon.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/physikon.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/physikon.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/physikon.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1920"}],"version-history":[{"count":16,"href":"http:\/\/physikon.net\/index.php?rest_route=\/wp\/v2\/posts\/1920\/revisions"}],"predecessor-version":[{"id":7703,"href":"http:\/\/physikon.net\/index.php?rest_route=\/wp\/v2\/posts\/1920\/revisions\/7703"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/physikon.net\/index.php?rest_route=\/wp\/v2\/media\/1418"}],"wp:attachment":[{"href":"http:\/\/physikon.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/physikon.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1920"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/physikon.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}