Investigation of CeRh2As2 order parameters via ultrasound propagation anomalies

Investigation of CeRh2As2 order parameters via ultrasound propagation anomalies | 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 Investigation of CeRh 2 As 2 order parameters via ultrasound propagation anomalies Stanislaw Galeski, Changhee Lee, Florian Bartl, Jeremy Sourd, and 10 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8959867/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Unconventional superconductors with nearly degenerate pairing states are rare. CeRh2As2has recently emerged as one of the few known multi-phase superconductors. It exhibits a first-order phase transition between two distinct superconducting states when a magnetic field is applied along the crystallographic c axis. While this behavior has been linked to locally broken inversion symmetry, a phase diagram based on a multicomponent superconducting order parameter remains a possibility. Furthermore, superconductivity appears to coexist with an ordered state (phase I). Despite extensive experimental and theoretical studies, the nature of the order parameters in both superconducting phases and in phase I remains unresolved. Here we use ultrasound-propagation measurements, a probe sensitive to order parameter symmetry, at low temperatures, in high magnetic fields, and under hydrostatic pressure to address this issue. Our results strongly suggest that the superconducting order parameter in both phases is single-component, thereby experimentally establishing local non-centrosymmetry as the mechanism leading to multi-phase superconductivity in CeRh2As2. In addition, analysis of the elastic anomalies within a symmetry-based Landau framework indicates the presence of an incommensurate magnetic order parameter in phase I. Physical sciences/Materials science/Condensed-matter physics/Phase transitions and critical phenomena Physical sciences/Physics/Condensed-matter physics/Superconducting properties and materials Full Text Additional Declarations There is NO Competing Interest. Supplementary Files CeRh2As2multicomponentSM.pdf Supplemental Material: Constrains on the order parameters of CeRh2As2 derived form low temperature ultrasonic spectroscopy. Cite Share Download PDF Status: Under Review 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. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-8959867","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":624475036,"identity":"3ace37f0-d7d3-4aac-be66-dd273008c38f","order_by":0,"name":"Stanislaw 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CeRh2As2has recently emerged as one of the few known multi-phase superconductors. It exhibits a first-order phase transition between two distinct superconducting states when a magnetic field is applied along the crystallographic c axis. While this behavior has been linked to locally broken inversion symmetry, a phase diagram based on a multicomponent superconducting order parameter remains a possibility. Furthermore, superconductivity appears to coexist with an ordered state (phase I). Despite extensive experimental and theoretical studies, the nature of the order parameters in both superconducting phases and in phase I remains unresolved. Here we use ultrasound-propagation measurements, a probe sensitive to order parameter symmetry, at low temperatures, in high magnetic fields, and under hydrostatic pressure to address this issue. Our results strongly suggest that the superconducting order parameter in both phases is single-component, thereby experimentally establishing local non-centrosymmetry as the mechanism leading to multi-phase superconductivity in CeRh2As2. In addition, analysis of the elastic anomalies within a symmetry-based Landau framework indicates the presence of an incommensurate magnetic order parameter in phase I.","manuscriptTitle":"Investigation of CeRh2As2 order parameters via ultrasound propagation anomalies","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-04-20 05:22:40","doi":"10.21203/rs.3.rs-8959867/v1","editorialEvents":[],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"nature-physics","isNatureJournal":true,"hasQc":false,"allowDirectSubmit":false,"externalIdentity":"nphys","sideBox":"Learn more about [Nature Physics](http://www.nature.com/nphys/)","snPcode":"","submissionUrl":"","title":"Nature Physics","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"ejp","reportingPortfolio":"Nature Research","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"795a0a54-8c85-42d0-8082-5605b6f5f8cd","owner":[],"postedDate":"April 20th, 2026","published":true,"recentEditorialEvents":[{"type":"editorInvitedReview","content":"This content is not available.","date":"2026-05-11T17:38:02+00:00","index":3,"fulltext":"This content is not available."},{"type":"editorInvitedReview","content":"This content is not available.","date":"2026-05-04T12:29:37+00:00","index":2,"fulltext":"This content is not available."},{"type":"editorInvitedReview","content":"This content is not available.","date":"2026-04-30T17:18:07+00:00","index":1,"fulltext":"This content is not available."}],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[{"id":66618845,"name":"Physical sciences/Materials science/Condensed-matter physics/Phase transitions and critical phenomena"},{"id":66618846,"name":"Physical sciences/Physics/Condensed-matter physics/Superconducting properties and materials"}],"tags":[],"updatedAt":"2026-04-20T05:22:40+00:00","versionOfRecord":[],"versionCreatedAt":"2026-04-20 05:22:40","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-8959867","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-8959867","identity":"rs-8959867","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}