{"id":1611,"date":"2025-12-01T17:48:46","date_gmt":"2025-12-01T08:48:46","guid":{"rendered":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/?post_type=topics&#038;p=1611"},"modified":"2025-12-02T17:49:59","modified_gmt":"2025-12-02T08:49:59","slug":"frustrated-magnetism-induced-by-orbital-ordering-in-alkali-superoxides","status":"publish","type":"topics","link":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/topics\/frustrated-magnetism-induced-by-orbital-ordering-in-alkali-superoxides\/","title":{"rendered":"Frustrated magnetism induced by orbital ordering in alkali superoxides"},"content":{"rendered":"<p>Alkali superoxides AO<sub>2<\/sub> (A = Na, K, Rb, Cs) are strongly correlated materials in which the oxygen molecular ion O<sub>2<\/sub><sup>\u2212<\/sup> possesses both spin and orbital degrees of freedom. Among them, CsO<sub>2<\/sub> is known to exhibit a rapid enhancement of magnetic correlations below 70 K, but the origin of this behavior has remained unclear. We constructed an effective model based on the energy bands obtained from first-principles calculations and analyzed its magnetic properties. As a result, we revealed that at low temperatures an \u201corbital order,\u201d in which the orbital arrangement becomes aligned, emerges, and that this ordering significantly enhances the geometric frustration of the spins.<\/p>\n<p>Several materials have been known in which orbital order simplifies the connectivity of spins, effectively leading to a \u201cone-dimensional\u201d magnetic network. However, it is extremely rare cases that orbital order instead makes the spin network more complicated. In this study, we pointed out for the first time that CsO<sub>2<\/sub> may belong to this uncommon category.<\/p>\n<p>The paper reporting these findings was selected as an Editors\u2019 Suggestion in Physical Review B, published by the American Physical Society.<\/p>\n<p>K. Shibata, M. Naka, H. O. Jeschke, J. Otsuki<br \/><a href=\"https:\/\/journals.aps.org\/prb\/abstract\/10.1103\/PhysRevB.109.235115\" rel=\"noopener\" target=\"_blank\">Phys. Rev. B <strong>109<\/strong>, 235115 (2024) \uff0dPublished 7 June 2024 <\/a><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-content\/uploads\/2025\/12\/AO2_wide.png\" alt=\"\" width=\"700\"  class=\"aligncenter size-full wp-image-1591\" srcset=\"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-content\/uploads\/2025\/12\/AO2_wide.png 999w, https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-content\/uploads\/2025\/12\/AO2_wide-300x205.png 300w, https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-content\/uploads\/2025\/12\/AO2_wide-768x525.png 768w\" sizes=\"(max-width: 999px) 100vw, 999px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Alkali superoxides AO2 (A = Na, K, Rb, Cs) are strongly correlated materials in  &#8230; <\/p>\n","protected":false},"author":1,"featured_media":1590,"menu_order":0,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-1611","topics","type-topics","status-publish","format-standard","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/topics\/1611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/types\/topics"}],"author":[{"embeddable":true,"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":3,"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/topics\/1611\/revisions"}],"predecessor-version":[{"id":1614,"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/topics\/1611\/revisions\/1614"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/media\/1590"}],"wp:attachment":[{"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/media?parent=1611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/categories?post=1611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.physics.okayama-u.ac.jp\/jeschke-otsuki-group\/wp-json\/wp\/v2\/tags?post=1611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}