{"id":592,"date":"2025-11-07T15:27:16","date_gmt":"2025-11-07T15:27:16","guid":{"rendered":"https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/?p=592"},"modified":"2025-11-07T15:27:16","modified_gmt":"2025-11-07T15:27:16","slug":"cracking-the-code-of-orbital-selectivity-in-an-unconventional-superconductor","status":"publish","type":"post","link":"https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/?p=592","title":{"rendered":"Cracking the Code of Orbital Selectivity in an Unconventional Superconductor"},"content":{"rendered":"<div id=\"pl-592\"  class=\"panel-layout\" ><div id=\"pg-592-0\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-592-0-0\"  class=\"panel-grid-cell\" ><div id=\"panel-592-0-0-0\" class=\"so-panel widget widget_sow-editor panel-first-child panel-last-child\" data-index=\"0\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p><img decoding=\"async\" class=\"alignleft size-full wp-image-593\" src=\"https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/wp-content\/uploads\/2025\/11\/Bozin-publikacija.tif\" alt=\"\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-595\" src=\"https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/wp-content\/uploads\/2025\/11\/cm5c01488_0008-300x172.webp\" alt=\"\" width=\"300\" height=\"172\" srcset=\"https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/wp-content\/uploads\/2025\/11\/cm5c01488_0008-300x172.webp 300w, https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/wp-content\/uploads\/2025\/11\/cm5c01488_0008.webp 500w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Contributions from the <a href=\"https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/\"><strong>HIP-2D-QM<\/strong><\/a> project at <a href=\"https:\/\/www.bnl.gov\/staff\/bozin\"><strong>IPB<\/strong><\/a>\u2019s <a href=\"http:\/\/solidstate.ipb.ac.rs\/\"><strong>Center for Solid State physics and New Materials<\/strong><\/a> , as part of collaborative research led by <a href=\"https:\/\/www.forth.gr\/en\/home\/\"><strong>FORTH<\/strong><\/a>\u2019s <a href=\"https:\/\/www.iesl.forth.gr\/en\/research\/magnetic-materials\"><strong>Quantum Materials and Magnetism Lab<\/strong><\/a> , help revealing that strong electron correlations drive intertwined electronic and structural instabilities at the core of multiorbital superconducting pairing.<\/p>\n<p>In a new series of complementary experiments [1], scientists from the Institute of Electronic Structure and Laser (IESL) at <a href=\"https:\/\/www.forth.gr\/en\/home\/\"><strong>FORTH<\/strong><\/a> \u2014 Myrsini Kaitatzi, Alexandros Deltsidis, Izar Capel Berdiell, and Alexandros Lappas \u2014 working closely with collaborators from <a href=\"https:\/\/www.cells.es\/en\/instruments\/beamlines\"><strong>ALBA<\/strong><\/a> (Laura Simonelli, Alexander Missyul), <a href=\"https:\/\/photon-science.desy.de\/facilities\/petra_iii\/beamlines\/index_eng.html\"><strong>DESY<\/strong><\/a> (Martin Etter), and <a href=\"https:\/\/www.bnl.gov\/staff\/bozin\"><strong>IPB<\/strong><\/a> (Emil S. Bozin), explore a fundamental question at the forefront of condensed matter research: <em>how strong must electron\u2013electron interactions become to raise the temperature at which superconductivity appears<\/em>?<\/p>\n<p>By harnessing brilliant synchrotron light sources, the researchers reveal previously hidden phases that clarify the delicate interplay between electronic orders\u2014an essential factor shaping the behavior of quantum materials, especially those where electrons move without resistance.<\/p>\n<p>The team\u2019s findings spotlight a novel two-dimensional (2D) iron-based material designed to conduct electricity without losses\u2014paving the way for energy-efficient systems and next-generation electronics that demand far less cooling than today\u2019s superconductors. By combining intercalation chemistry for precise property control, X-ray total scattering for detailed structural information, and high-resolution core-level spectroscopies (XAS, XES) with element-specific, femtosecond sensitivity, the researchers uncover site-local fluctuations that reveal an emerging electron-correlation\u2013driven instability.<\/p>\n<p>As the material cools, this instability emerges as an unconventional form of negative thermal expansion caused by intricate magnetic interactions. Under the Mott\u2013Hund\u2019s framework\u2014which describes how electrons shift between mobile and localized behavior\u2014orbital differentiation is found to temper electronic correlations and support spin-fluctuation\u2013driven interactions. These combined effects point to new strategies for creating layered quantum materials where superconductivity and magnetism can coexist and possibly reach higher transition temperatures.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Reference<\/strong><\/p>\n<p>[1] A. Lappas, M. Kaitatzi, A. Deltsidis, I. Capel Berdiell, L. Simonelli, A. Missyul, M. Etter, and E.S. Bozin, \u201cOrbital-Selective Instabilities and Spin Fluctuations at the Verge of Superconductivity in Interlayer-Expanded Iron Selenide\u201d, <em>Chemistry of Materials<\/em> (2025).<\/p>\n<p>DOI: <a href=\"https:\/\/doi.org\/10.1021\/acs.chemmater.5c01488\">https:\/\/doi.org\/10.1021\/acs.chemmater.5c01488<\/a>.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Contributions from the HIP-2D-QM project at IPB\u2019s Center for Solid State physics and New Materials , as part of collaborative research led by FORTH\u2019s Quantum Materials and Magnetism Lab , help revealing that strong electron correlations drive intertwined electronic and structural instabilities at the core of multiorbital superconducting pairing. In a new series of complementary [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":595,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cracking the Code of Orbital Selectivity in an Unconventional Superconductor - HIP-2D-QM<\/title>\n<meta name=\"description\" content=\"Contributions from the HIP-2D-QM project at IPB\u2019s Center for Solid State physics and New Materials , as part of collaborative research led by FORTH\u2019s Quantum Materials and Magnetism Lab , help revealing that strong electron correlations drive intertwined electronic and structural instabilities at the core of multiorbital superconducting pairing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hip2dqm.solidstate.ipb.ac.rs\/?p=592\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cracking the Code of Orbital Selectivity in an Unconventional Superconductor - 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