dc.contributor.author | Mæland, Kristian | |
dc.contributor.author | Sudbø, Asle | |
dc.date.accessioned | 2024-01-22T08:51:40Z | |
dc.date.available | 2024-01-22T08:51:40Z | |
dc.date.created | 2023-12-06T16:20:09Z | |
dc.date.issued | 2023 | |
dc.identifier.issn | 2469-9950 | |
dc.identifier.uri | https://hdl.handle.net/11250/3112960 | |
dc.description.abstract | Hybrid 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.abstract | Exceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach | |
dc.language.iso | eng | |
dc.relation.uri | https://journals.aps.org/prb/pdf/10.1103/PhysRevB.108.214511 | |
dc.subject | Superledning | |
dc.subject | Superconductivity | |
dc.subject | Multibånd superledning | |
dc.subject | Multiband superconductivity | |
dc.title | Exceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach | |
dc.title.alternative | Exceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach | |
dc.type | Peer reviewed | |
dc.type | Journal article | |
dc.description.version | publishedVersion | |
dc.subject.nsi | VDP::Kondenserte fasers fysikk: 436 | |
dc.subject.nsi | VDP::Condensed matter physics: 436 | |
dc.source.volume | 108 | |
dc.source.journal | Physical review B (PRB) | |
dc.identifier.doi | 10.1103/PhysRevB.108.214511 | |
dc.identifier.cristin | 2209994 | |
dc.relation.project | Norges forskningsråd: 262633 | |
dc.relation.project | Norges forskningsråd: 323766 | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |