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dc.contributor.authorMæland, Kristian
dc.contributor.authorSudbø, Asle
dc.date.accessioned2024-01-22T08:51:40Z
dc.date.available2024-01-22T08:51:40Z
dc.date.created2023-12-06T16:20:09Z
dc.date.issued2023
dc.identifier.issn2469-9950
dc.identifier.urihttps://hdl.handle.net/11250/3112960
dc.description.abstractHybrid systems of superconductors and magnets display several intriguing properties, both from a fundamental physics point of view and with practical applications. Promising applications in superconducting spintronics motivate a search for systems where superconductivity can survive larger in-plane critical magnetic fields than the conventional limit. The Chandrasekhar-Clogston (CC) limit applies to thin-film conventional superconductors with in-plane magnetic fields such that orbital effects may be ignored. For a magnetic field strength comparable to the superconducting gap at zero temperature and zero field, a spin-split normal state attains lower free energy than the superconducting state. A multiband superconductor with a flat band placed just below the Fermi surface has been shown to surpass the CC limit using weak-coupling theory. Since the dimensionless coupling determining the critical temperature scales with the density of states, it is natural to anticipate corrections from strong-coupling theory in flat-band systems, owing to the large density of states of the flat bands. We derive Eliashberg equations and the free energy for a multiband superconductor in a magnetic field. First, we show that the CC limit can be exceeded by a small amount in one-band strong-coupling superconductors due to self-energy renormalization of the magnetic field. Next, we consider a two-band system with one flat band and find that the CC limit can be exceeded by a large amount also in strong-coupling theory, even when including hybridization between bands that intersect.
dc.description.abstractExceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach
dc.language.isoeng
dc.relation.urihttps://journals.aps.org/prb/pdf/10.1103/PhysRevB.108.214511
dc.subjectSuperledning
dc.subjectSuperconductivity
dc.subjectMultibånd superledning
dc.subjectMultiband superconductivity
dc.titleExceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach
dc.title.alternativeExceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersion
dc.subject.nsiVDP::Kondenserte fasers fysikk: 436
dc.subject.nsiVDP::Condensed matter physics: 436
dc.source.volume108
dc.source.journalPhysical review B (PRB)
dc.identifier.doi10.1103/PhysRevB.108.214511
dc.identifier.cristin2209994
dc.relation.projectNorges forskningsråd: 262633
dc.relation.projectNorges forskningsråd: 323766
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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