{"paper_id":"4b8d5ea1-bf95-4f61-b024-0640c8c9952e","body_text":"Spin-orbit crossover and the origin of magnetic torque in kagome metals | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Spin-orbit crossover and the origin of magnetic torque in kagome metals Harley Scammell, Mathias Scheurer This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7191977/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Recent experiments on the kagome metal CsV 3 Sb 5 reveal a curious phase transition-like feature: a nematic magnetic torque response that abruptly sets in at T τ ≈ 130 K, above the known charge density wave transition at T CDW ≈ 100 K. Counterintuitively, elastoresistance measurements—a standard probe of nematicity—show no corresponding signal, ruling out a nematic phase transition and placing strong constraints on possible explanations. Beyond nematicity, the torque is paramagnetic for in-plane magnetic field, while above a critical out-of-plane field, an in-plane magnetisation appears, accompanied by hysteresis. We show that this combination of features cannot be accounted for by charge density waves or intraband magnetic order. Instead, we propose that interband ordering—via a symmetry-allowed interband spin-orbit coupling and a time-reversal and spatial symmetry-breaking interband order parameter—together with a background strain field, consistent with typical experimental conditions, provides a natural explanation; in our picture, the behaviour at T τ is understood as a crossover in the symmetry-allowed interband spin-orbit coupling strength. Our theory accounts for the nematic magnetic torque, hysteresis, and the transition-like onset at T τ , while also making testable predictions, including strain-induced magnetisation. In doing so, it challenges the prevailing view of the normal state. Physical sciences/Physics/Condensed-matter physics/Electronic properties and materials Physical sciences/Physics/Condensed-matter physics/Phase transitions and critical phenomena Full Text Additional Declarations There is NO Competing Interest. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {\"props\":{\"pageProps\":{\"initialData\":{\"identity\":\"rs-7191977\",\"acceptedTermsAndConditions\":true,\"allowDirectSubmit\":true,\"archivedVersions\":[],\"articleType\":\"Article\",\"associatedPublications\":[],\"authors\":[{\"id\":499385115,\"identity\":\"c238144a-3339-4116-b532-48f3d3c2f7c8\",\"order_by\":0,\"name\":\"Harley Scammell\",\"email\":\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABA0lEQVRIiWNgGAWjYBACAwYGxgNw3oMCGyDJ2HgAl3KoFgaEggSDNJCWBpK0HAbTeLWYs599cOBjW508/7TTiQ8SDM7brW0/DLSlxiYalxbLnnSDgzPbDhvOuJ272SDB4HbytjOJQC3H0nIbcDnsQBrDYd62AwkMt3O3SYC0mB0AamFsOIxby/lnDIf/ttUlyN/O3f4jweBcstn5hwS03ADawtjGDDQ/dxvQ+wfszG4QsuXGM4aDPecOG24E+gXosOQEsxtAWxLw+eV8GuODH2V18nK3czd++FBhZ292Pv3hgw81Nji1gAEjG4KdCFaZgE85GPxBMO0JKh4Fo2AUjIIRBwCaU2zitSaWQQAAAABJRU5ErkJggg==\",\"orcid\":\"https://orcid.org/0000-0001-8969-6064\",\"institution\":\"University of Technology Sydney\",\"correspondingAuthor\":true,\"prefix\":\"\",\"firstName\":\"Harley\",\"middleName\":\"\",\"lastName\":\"Scammell\",\"suffix\":\"\"},{\"id\":499385116,\"identity\":\"801eddd4-bbc9-41bd-8625-f4164f2ebc03\",\"order_by\":1,\"name\":\"Mathias Scheurer\",\"email\":\"\",\"orcid\":\"https://orcid.org/0000-0002-9439-5159\",\"institution\":\"University of Innsbruck\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Mathias\",\"middleName\":\"\",\"lastName\":\"Scheurer\",\"suffix\":\"\"}],\"badges\":[],\"createdAt\":\"2025-07-23 04:35:13\",\"currentVersionCode\":1,\"declarations\":\"\",\"doi\":\"10.21203/rs.3.rs-7191977/v1\",\"doiUrl\":\"https://doi.org/10.21203/rs.3.rs-7191977/v1\",\"draftVersion\":[],\"editorialEvents\":[],\"editorialNote\":\"\",\"failedWorkflow\":false,\"files\":[{\"id\":108491297,\"identity\":\"2a125660-abc2-4a33-b45b-bd5dd24b38d6\",\"added_by\":\"auto\",\"created_at\":\"2026-05-05 09:53:10\",\"extension\":\"pdf\",\"order_by\":1,\"title\":\"\",\"display\":\"\",\"copyAsset\":false,\"role\":\"manuscript-pdf\",\"size\":711794,\"visible\":true,\"origin\":\"\",\"legend\":\"Article File\",\"description\":\"\",\"filename\":\"Main.pdf\",\"url\":\"https://assets-eu.researchsquare.com/files/rs-7191977/v1_covered_d01ed08b-bd4e-4ea6-a671-022073533be6.pdf\"}],\"financialInterests\":\"There is \\u003cb\\u003eNO\\u003c/b\\u003e Competing Interest.\",\"formattedTitle\":\"Spin-orbit crossover and the origin of magnetic torque in kagome metals\",\"fulltext\":[],\"fulltextSource\":\"\",\"fullText\":\"\",\"funders\":[],\"hasAdminPriorityOnWorkflow\":false,\"hasManuscriptDocX\":false,\"hasOptedInToPreprint\":true,\"hasPassedJournalQc\":\"\",\"hasAnyPriority\":true,\"hideJournal\":true,\"highlight\":\"\",\"institution\":\"\",\"isAcceptedByJournal\":false,\"isAuthorSuppliedPdf\":true,\"isDeskRejected\":\"\",\"isHiddenFromSearch\":false,\"isInQc\":false,\"isInWorkflow\":false,\"isPdf\":true,\"isPdfUpToDate\":true,\"isWithdrawnOrRetracted\":false,\"journal\":{\"display\":true,\"email\":\"info@researchsquare.com\",\"identity\":\"researchsquare\",\"isNatureJournal\":false,\"hasQc\":true,\"allowDirectSubmit\":true,\"externalIdentity\":\"\",\"sideBox\":\"\",\"snPcode\":\"\",\"submissionUrl\":\"/submission\",\"title\":\"Research Square\",\"twitterHandle\":\"researchsquare\",\"acdcEnabled\":true,\"dfaEnabled\":false,\"editorialSystem\":\"\",\"reportingPortfolio\":\"\",\"inReviewEnabled\":false,\"inReviewRevisionsEnabled\":true},\"keywords\":\"\",\"lastPublishedDoi\":\"10.21203/rs.3.rs-7191977/v1\",\"lastPublishedDoiUrl\":\"https://doi.org/10.21203/rs.3.rs-7191977/v1\",\"license\":{\"name\":\"CC BY 4.0\",\"url\":\"https://creativecommons.org/licenses/by/4.0/\"},\"manuscriptAbstract\":\"Recent experiments on the kagome metal CsV\\u003csub\\u003e3\\u003c/sub\\u003eSb\\u003csub\\u003e5\\u003c/sub\\u003e reveal a curious phase transition-like feature: a nematic magnetic torque response that abruptly sets in at T\\u003csub\\u003eτ\\u003c/sub\\u003e ≈ 130 K, above the known charge density wave transition at T\\u003csub\\u003eCDW\\u003c/sub\\u003e ≈ 100 K. Counterintuitively, elastoresistance measurements—a standard probe of nematicity—show no corresponding signal, ruling out a nematic phase transition and placing strong constraints on possible explanations. Beyond nematicity, the torque is paramagnetic for in-plane magnetic field, while above a critical out-of-plane field, an in-plane magnetisation appears, accompanied by hysteresis. We show that this combination of features cannot be accounted for by charge density waves or intraband magnetic order. Instead, we propose that interband ordering—via a symmetry-allowed interband spin-orbit coupling and a time-reversal and spatial symmetry-breaking interband order parameter—together with a background strain field, consistent with typical experimental conditions, provides a natural explanation; in our picture, the behaviour at T\\u003csub\\u003eτ\\u003c/sub\\u003e is understood as a crossover in the symmetry-allowed interband spin-orbit coupling strength. 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