Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets

Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets | 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 Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets Wei Li This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6933063/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 27 Nov, 2025 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Abstract Quantum critical points (QCPs) ubiquitously emerge in strongly correlated systems, with their influence extending beyond zero temperature. There exist extended quantum critical regimes (QCRs) at finite temperatures and external fields. A paradigmatic example exhibiting QCP is quantum Ising magnets like CoNb 2 O 6 , where critical quantum fluctuations and robust universal scaling behavior provide crucial insights into the quantum material. In this work, we discover a fundamentally distinct quantum supercritical regime (QSR) emerging also from the QCP but controlled by symmetry-breaking fields (h) coupled to the order parameter. The QSR is enclosed by the crossover boundaries T~h zν/Δ , where z, ν and Δ≡β+γ are critical exponents. Amongst other intriguing phenomena, there exists an enhanced magnetocaloric effect (MCE) in QSR, characterized by a universally diverging magnetic Gr"uneisen ratio Γ h ≡1/T(∂T/∂h) S ~T -Δ/zν . Even small symmetry-breaking fields generate dramatic temperature variations. The supercritical scaling can be comprehended via thermal data collapse based on the derived scaling form. We propose to observe the QSR and related supercritical MCE in CoNb 2 O 6 and other quantum Ising magnets, which may enable cryogenic technologies capable of reaching the millikelvin regime without relying on helium-3. Physical sciences/Physics/Condensed-matter physics/Magnetic properties and materials Physical sciences/Physics/Condensed-matter physics/Phase transitions and critical phenomena Full Text Additional Declarations There is NO Competing Interest. Supplementary Files Supplementary.pdf Supplementary Information for Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets Cite Share Download PDF Status: Published Journal Publication published 27 Nov, 2025 Read the published version in Nature Communications → 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. 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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-6933063","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":476462587,"identity":"c3147704-a5b9-4be9-99f4-defe7e0f51c5","order_by":0,"name":"Wei Li","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAoElEQVRIiWNgGAWjYFAC5oYDHwxI08LYcHCGAWl6GBuYeRhI0WJwgLHxsE3BnzwG9sMPGH7uIE5Lw+EcA4NiBp40A8beM0RoMYNqSWxgyGFgZmwjVosFSAv/G1K0MIC0SBBri/1hYCD3GBgXs0k8MzjYS4wWyfbmwx9+/JHL4+dPfvjgJzFaGJghVAIbkDhAjAY4SCBJ9SgYBaNgFIwsAABxEzJf5w9jUgAAAABJRU5ErkJggg==","orcid":"https://orcid.org/0000-0003-0474-9337","institution":"Institute of Theoretical Physics","correspondingAuthor":true,"prefix":"","firstName":"Wei","middleName":"","lastName":"Li","suffix":""}],"badges":[],"createdAt":"2025-06-19 16:40:32","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-6933063/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6933063/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1038/s41467-025-65651-w","type":"published","date":"2025-11-27T05:00:00+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":96974316,"identity":"bb1deb75-b3e9-4cdc-95f1-d4a2db452e1e","added_by":"auto","created_at":"2025-11-28 08:15:46","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":2039260,"visible":true,"origin":"","legend":"Article File","description":"","filename":"QSR.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6933063/v1_covered_3e4f9118-54ee-409b-985c-3212efe49020.pdf"},{"id":85530412,"identity":"1ae00cd1-258a-4c1c-a163-d2cfb787894b","added_by":"auto","created_at":"2025-06-27 02:49:44","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"supplement","size":3001060,"visible":true,"origin":"","legend":"Supplementary Information for Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets","description":"","filename":"Supplementary.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6933063/v1/17b1c9d4355d5a2a36be54b2.pdf"}],"financialInterests":"There is \u003cb\u003eNO\u003c/b\u003e Competing Interest.","formattedTitle":"Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"nature-portfolio","isNatureJournal":true,"hasQc":false,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"","title":"Nature Portfolio","twitterHandle":"","acdcEnabled":false,"dfaEnabled":false,"editorialSystem":"ejp","reportingPortfolio":"","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"","lastPublishedDoi":"10.21203/rs.3.rs-6933063/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6933063/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"Quantum critical points (QCPs) ubiquitously emerge in strongly correlated systems, with their \r\ninfluence extending beyond zero temperature. There exist extended quantum critical regimes (QCRs) \r\nat finite temperatures and external fields. \r\nA paradigmatic example exhibiting QCP is quantum Ising magnets like CoNb\u003csub\u003e2\u003c/sub\u003eO\u003csub\u003e6\u003c/sub\u003e, where critical quantum fluctuations \r\nand robust universal scaling behavior provide crucial insights into the quantum material.\r\nIn this work, we discover a fundamentally distinct quantum supercritical regime (QSR) \r\nemerging also from the QCP but controlled by symmetry-breaking fields (h) coupled to the order parameter. \r\nThe QSR is enclosed by the crossover boundaries T~h\u003csup\u003ezν/Δ\u003c/sup\u003e, where z, ν and \r\nΔ≡β+γ are critical exponents. Amongst other intriguing phenomena, there exists \r\nan enhanced magnetocaloric effect (MCE) in QSR, characterized by a universally diverging magnetic \r\nGr\\\"uneisen ratio Γ\u003csub\u003eh\u003c/sub\u003e≡1/T(∂T/∂h)\u003csub\u003eS\u003c/sub\u003e~T\u003csup\u003e-Δ/zν\u003c/sup\u003e. \r\nEven small symmetry-breaking fields generate dramatic temperature variations. \r\nThe supercritical scaling can be comprehended via thermal data collapse based on the derived scaling form.\r\nWe propose to observe the QSR and related supercritical MCE in CoNb\u003csub\u003e2\u003c/sub\u003eO\u003csub\u003e6\u003c/sub\u003e and other quantum Ising magnets, \r\nwhich may enable cryogenic technologies capable of reaching the millikelvin regime without relying on helium-3.","manuscriptTitle":"Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-06-27 02:49:40","doi":"10.21203/rs.3.rs-6933063/v1","editorialEvents":[],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"nature-communications","isNatureJournal":true,"hasQc":false,"allowDirectSubmit":false,"externalIdentity":"NCOMMS","sideBox":"Learn more about [Nature Communications](http://www.nature.com/ncomms/)","snPcode":"","submissionUrl":"https://mts-ncomms.nature.com/","title":"Nature Communications","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"ejp","reportingPortfolio":"Nature Communications","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"d050a07b-e109-4bb2-ae34-90f49f8a66e2","owner":[],"postedDate":"June 27th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":50596330,"name":"Physical sciences/Physics/Condensed-matter physics/Magnetic properties and materials"},{"id":50596331,"name":"Physical sciences/Physics/Condensed-matter physics/Phase transitions and critical phenomena"}],"tags":[],"updatedAt":"2025-11-28T08:15:38+00:00","versionOfRecord":{"articleIdentity":"rs-6933063","link":"https://doi.org/10.1038/s41467-025-65651-w","journal":{"identity":"nature-communications","isVorOnly":false,"title":"Nature Communications"},"publishedOn":"2025-11-27 05:00:00","publishedOnDateReadable":"November 27th, 2025"},"versionCreatedAt":"2025-06-27 02:49:40","video":"","vorDoi":"10.1038/s41467-025-65651-w","vorDoiUrl":"https://doi.org/10.1038/s41467-025-65651-w","workflowStages":[]},"version":"v1","identity":"rs-6933063","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6933063","identity":"rs-6933063","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}