Experimental evidence of Tc enhancement above 50 K and diode and paramagnetic-Meissner effects, in Nickelate films on highly reduced SrTiO3

Experimental evidence of Tc enhancement above 50 K and diode and paramagnetic-Meissner effects, in Nickelate films on highly reduced SrTiO3 | 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 Research Article Experimental evidence of Tc enhancement above 50 K and diode and paramagnetic-Meissner effects, in Nickelate films on highly reduced SrTiO 3 Gad Koren, Anna Eyal This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6070455/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 Since the discovery of superconductivity in nickelate thin films in 2019, the quest for enhancing their Tc has been ongoing. Here we provide experimental evidence for Tc enhancement in oxygen deficient films on highly reduced and conducting SrT iO3 substrates. Tc onset of 50-70 K was found in Meissner and transport measurements, which indicates superconductivity in islands or domains in our films, where Tc of zero resistance is obtained at 20-25 K. In addition, we observed a giant paramagnetic-Meissner effect peak at about 48 K, which further supports the existence of a superconductive transition just above it. Furthermore, an asymmetric or nonreciprocal and non-hysteretic superconductive diode effect was observed. The later could be fully polarized, and its polarity could be reversed. The specific phase responsible for these notable effects was not yet identified, and further research is needed in order to identify and isolate the relevant phase. Hard Condensed-matter Physics Nickelates Superconductivity Diode effect Paramagnetic Meissner effect Full Text Additional Declarations The authors declare no competing interests. Supplementary Files NSNOSupplementalEyalandKoren.pdf Supplemental for NSNO paper 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. 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-6070455","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":418472142,"identity":"777ad5e0-3cfa-4ac4-807b-5146aa2ae743","order_by":0,"name":"Gad Koren","email":"data:image/png;base64,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","orcid":"https://orcid.org/0000-0001-8741-1010","institution":"Technion","correspondingAuthor":true,"prefix":"","firstName":"Gad","middleName":"","lastName":"Koren","suffix":""},{"id":418472143,"identity":"fdcb9039-fe0e-48bb-a2b4-533ff71d30a9","order_by":1,"name":"Anna Eyal","email":"","orcid":"","institution":"Technion","correspondingAuthor":false,"prefix":"","firstName":"Anna","middleName":"","lastName":"Eyal","suffix":""}],"badges":[],"createdAt":"2025-02-20 09:21:41","currentVersionCode":1,"declarations":{"humanSubjects":false,"vertebrateSubjects":false,"conflictsOfInterestStatement":false,"humanSubjectEthicalGuidelines":false,"humanSubjectConsent":false,"humanSubjectClinicalTrial":false,"humanSubjectCaseReport":false,"vertebrateSubjectEthicalGuidelines":false},"doi":"10.21203/rs.3.rs-6070455/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6070455/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":77094411,"identity":"21b877b7-485d-4fea-837a-77702aba74e9","added_by":"auto","created_at":"2025-02-25 06:08:35","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":3051881,"visible":true,"origin":"","legend":"","description":"","filename":"NSNOpaperEyalandKoren.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6070455/v1_covered_fef3b686-8f23-40ae-bbcd-36881ab59641.pdf"},{"id":77093826,"identity":"c0421054-080e-4f07-8f9e-1f8b8acf14ae","added_by":"auto","created_at":"2025-02-25 06:00:31","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"supplement","size":436403,"visible":true,"origin":"","legend":"\u003cp\u003eSupplemental for NSNO paper\u003c/p\u003e","description":"","filename":"NSNOSupplementalEyalandKoren.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6070455/v1/7fecc404d5fb63bf99ecfe70.pdf"}],"financialInterests":"The authors declare no competing interests.","formattedTitle":"\u003cp\u003eExperimental evidence of Tc enhancement above 50 K and diode and paramagnetic-Meissner effects, in Nickelate films on highly reduced SrTiO\u003csub\u003e3\u003c/sub\u003e\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"Technion - Israel Institute of Technology","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 Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Nickelates, Superconductivity, Diode effect, Paramagnetic Meissner effect","lastPublishedDoi":"10.21203/rs.3.rs-6070455/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6070455/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eSince the discovery of superconductivity in nickelate thin films in 2019, the quest for enhancing their Tc has been ongoing. 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