Competing pairing interactions responsible for the large upper critical field in a stoichiometric iron-based superconductor CaKFe4As4

dc.contributor.author Bristow, Matthew
dc.contributor.author Knafo, William
dc.contributor.author Reiss, Pascal
dc.contributor.author Meier, William
dc.contributor.author Canfield, Paul
dc.contributor.author Blundell, Stephen
dc.contributor.author Coldea, Amalia
dc.contributor.author Canfield, Paul
dc.contributor.department Ames Laboratory
dc.contributor.department Physics and Astronomy
dc.date 2020-05-23T02:41:19.000
dc.date.accessioned 2020-06-29T23:24:36Z
dc.date.available 2020-06-29T23:24:36Z
dc.date.issued 2020-04-01
dc.description.abstract <p>The upper critical field of multiband superconductors is an important quantity that can reveal details about the nature of the superconducting pairing. Here we experimentally map out the complete upper-critical-field phase diagram of a stoichiometric superconductor, CaKFe4As4, up to 90T for different orientations of the magnetic field and at temperatures down to 4.2K. The upper critical fields are extremely large, reaching values close to ∼3Tc at the lowest temperature, and the anisotropy decreases dramatically with temperature, leading to essentially isotropic superconductivity at 4.2K. We find that the temperature dependence of the upper critical field can be well described by a two-band model in the clean limit with band-coupling parameters favoring intraband over interband interactions. The large Pauli paramagnetic effects together with the presence of the shallow bands is consistent with the stabilization of an FFLO state at low temperatures in this clean superconductor.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_manuscripts/634/
dc.identifier.articleid 1640
dc.identifier.contextkey 17838842
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/634
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/7576
dc.language.iso en
dc.relation.ispartofseries IS-J 10199
dc.source.uri https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1709&context=physastro_pubs
dc.subject.disciplines Condensed Matter Physics
dc.title Competing pairing interactions responsible for the large upper critical field in a stoichiometric iron-based superconductor CaKFe4As4
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication c5a8128b-7d98-4b8f-92d7-b1385e345713
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
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