Magnon Gap Formation of Antiferromagnetic Topological Weyl semimetal in La0.1Eu0.9BiTe3

Magnon Gap Formation of Antiferromagnetic Topological Weyl semimetal in La0.1Eu0.9BiTe3 | 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 Magnon Gap Formation of Antiferromagnetic Topological Weyl semimetal in La 0.1 Eu 0.9 BiT e3 Jong-Soo Rhyee, Kwan-Young Lee, Kornelius Nielsch, Nicolas Perez, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8464616/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 Correlated magnon excitations in topologically non-trivial systems remain largely unexplored experimentally. Here, we report that 10% La-substituted single crystal La₀.₁Eu₀.₉BiTe₃ simultaneously host antiferromagnetic order (T N = 7 K) and a topological Weyl-semimetallic state with following a magnon gap formation. Magnetic susceptibility and low-temperature specific-heat measurements reveal a field-dependent minimum at T M = 5 K and a finite magnon gap that softens with increasing magnetic field-signatures of magnon gap formation. Electrical transport, including planar Hall measurements, follows semiclassical Boltzmann theory yet violates conventional Lorentz-force behavior, reflecting nontrivial Berry curvature effects. Angle-resolved photoemission spectroscopy directly visualizes linearly dispersive bulk bands and isolated two-fold-degenerate Weyl nodes. These results establish La₀.₁Eu₀.₉BiTe₃ as a versatile platform for investigating the interplay between correlated magnetic excitations and topological Weyl phases. Physical sciences/Physics/Condensed-matter physics/Topological matter/Topological insulators Physical sciences/Physics/Condensed-matter physics/Magnetic properties and materials magnon magnetic polaron La0.1Eu0.9BiTe3 topological semimetal Weyl semimetal Full Text Additional Declarations There is no conflict of interest Supplementary Files SupplementaryLaEuBiTe3NPG.docx Supplementary Materials 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-8464616","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":581595658,"identity":"b4c3bcbc-73bf-4c53-9d2b-5a63099322ef","order_by":0,"name":"Jong-Soo 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La\u003csub\u003e0.1\u003c/sub\u003eEu\u003csub\u003e0.9\u003c/sub\u003eBiT\u003csub\u003ee3\u003c/sub\u003e\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"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":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research 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Here, we report that 10% La-substituted single crystal La₀.₁Eu₀.₉BiTe₃ simultaneously host antiferromagnetic order (T\u003csub\u003eN\u003c/sub\u003e = 7 K) and a topological Weyl-semimetallic state with following a magnon gap formation. Magnetic susceptibility and low-temperature specific-heat measurements reveal a field-dependent minimum at T\u003csub\u003eM\u003c/sub\u003e = 5 K and a finite magnon gap that softens with increasing magnetic field-signatures of magnon gap formation. Electrical transport, including planar Hall measurements, follows semiclassical Boltzmann theory yet violates conventional Lorentz-force behavior, reflecting nontrivial Berry curvature effects. Angle-resolved photoemission spectroscopy directly visualizes linearly dispersive bulk bands and isolated two-fold-degenerate Weyl nodes. 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