{"id":21931,"date":"2025-06-30T14:08:30","date_gmt":"2025-06-30T12:08:30","guid":{"rendered":"https:\/\/lncmi.cnrs.fr\/?p=21931"},"modified":"2025-07-01T13:11:57","modified_gmt":"2025-07-01T11:11:57","slug":"crocl-a-frustrated-van-der-waals-magnet","status":"publish","type":"post","link":"https:\/\/lncmi.cnrs.fr\/en\/spectroscopies-for-semiconductors-and-nanostructures\/crocl-a-frustrated-van-der-waals-magnet\/","title":{"rendered":"CrOCl : a frustrated van der Waals magnet"},"content":{"rendered":"\n

On-site lattice frustration, in certain magnetic compounds featuring spin-spin interactions of various kinds between first, second, etc\u2026, neighbour lattice sites, leads to very rich magnetic phase diagrams comprising highly-degenerate disordered phases and complex spin orders. Varying the temperature, magnetic field or hydrostatic pressure, one can navigate through these exotic phase diagrams. Van der Waals magnetic materials are layered materials that can be thinned down to the monolayer limit, while retaining collective magnetic properties, different in nature from those of the bulk parent material. Depending on the lattice structure and on the nature\/strength of spin-spin interactions between different kinds of neighbour sites, these interactions may have antagonist effects, each promoting alone a different kind of order. Such competition of interactions prevents simple (i.e. ferro or antiferromagnetic) spin orders to develop, and instead favors nontrivial spin arrangements. Bulk chromium oxychloride CrOCl falls in this class of compounds \u2013 it is a frustrated magnet, possessing a rich phase diagram whose phases, have only been partly assigned.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Fig. 1: (left)\u00a0Low temperature magnetization of bulk CrOCl showing magnetization plateau and two hysteresis cycles indicating competing magnetic phases. Inset crystal structure of bulk CrOCl. (Right) Low temperature magneto-Raman scattering of bulk CrOCl showing series of zone folded phonon modes.<\/p>\n\n\n\n

Under an external magnetic field, different magnetic phases with magnetic cells up to fives times larger than the crystallographic are stabilized (see Fig 1 left) and induce a zone folding of the phonon modes. This allows \u2018reading\u2019 the magnetic ground states by tracing the evolution of the zone folded phonon modes as shown in Fig1 (right). These results demonstrate the strong coupling between the non-trivial spin configurations found in bulk CrOCl and lattice vibrations, highlighting the role of magneto-elastic interactions in frustrated magnets. Our findings expand the understanding of 2D magnetism, particularly in materials where frustration leads to unconventional spin states.<\/p>\n\n\n\n

More details in A. Pawbake, F. Petot, F. Le Mardel\u00e9, T. Riccardi, J. L\u00e9v\u00eaque, B. A. Piot, M. Orlita, J. Coraux, M. Hubert, J. Dzian, M. Veis, Y. Skourski, B. Wu, Z. Sofer, B. Gr\u00e9maud, A. Sa\u00fal, C. Faugeras, ACS Nano (2025), DOI : 10.1021\/acsnano.5c03174<\/p>\n","protected":false},"excerpt":{"rendered":"

On-site lattice frustration, in certain magnetic compounds featuring spin-spin interactions of various kinds between first, second, etc\u2026, neighbour lattice sites, leads to very rich magnetic phase diagrams comprising highly-degenerate disordered […]<\/p>\n","protected":false},"author":30,"featured_media":22971,"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":[292,6153,6154],"tags":[],"post_folder":[],"class_list":["post-21931","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-spectroscopies-for-semiconductors-and-nanostructures","category-spectroscopies-for-semiconductors-and-nanostructures-news"],"jetpack_featured_media_url":"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/CrOCl_TOC.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/21931","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\/30"}],"replies":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/comments?post=21931"}],"version-history":[{"count":0,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/21931\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media\/22971"}],"wp:attachment":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media?parent=21931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/categories?post=21931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/tags?post=21931"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/post_folder?post=21931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}