Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR

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dc.contributor.author Wiecki, Paul
dc.contributor.author Taufour, V.
dc.contributor.author Chung, D.
dc.contributor.author Canfield, Paul
dc.contributor.author Kanatzidis, M.
dc.contributor.author Bud’ko, Sergey
dc.contributor.author Canfield, Paul
dc.contributor.author Furukawa, Yuji
dc.contributor.department Ames Laboratory
dc.contributor.department Physics and Astronomy
dc.date 2018-03-02T01:33:16.000
dc.date.accessioned 2020-06-29T23:20:36Z
dc.date.available 2020-06-29T23:20:36Z
dc.date.issued 2018-02-01
dc.description.abstract <p>We present the results of 75 As nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), and resistivity measurements in KFe 2 As 2 under pressure ( p ). The temperature dependence of the NMR shift, nuclear spin-lattice relaxation time ( T 1 ), and resistivity show a crossover between a high-temperature incoherent, local-moment behavior and a low-temperature coherent behavior at a crossover temperature ( T ∗ ). T ∗ is found to increase monotonically with pressure, consistent with increasing hybridization between localized 3 d orbital-derived bands with the itinerant electron bands. No anomaly in T ∗ is seen at the critical pressure p c = 1.8 GPa where a change of slope of the superconducting (SC) transition temperature T c ( p ) has been observed. In contrast, T c ( p ) seems to correlate with antiferromagnetic spin fluctuations in the normal state as measured by the NQR 1 / T 1 data, although such a correlation cannot be seen in the replacement effects of A in the A Fe 2 As 2 ( A = K , Rb, Cs) family. In the superconducting state, two T 1 components are observed at low temperatures, suggesting the existence of two distinct local electronic environments. The temperature dependence of the short T 1 s indicates a nearly gapless state below T c . On the other hand, the temperature dependence of the long component 1 / T 1 L implies a large reduction in the density of states at the Fermi level due to the SC gap formation. These results suggest a real-space modulation of the local SC gap structure in KFe 2 As 2 under pressure.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_manuscripts/108/
dc.identifier.articleid 1111
dc.identifier.contextkey 11681116
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/108
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/7022
dc.language.iso en
dc.relation.ispartofseries IS-J 9572
dc.source.bitstream archive/lib.dr.iastate.edu/ameslab_manuscripts/108/IS_J_9572.pdf|||Fri Jan 14 18:28:32 UTC 2022
dc.source.uri 10.1103/PhysRevB.97.064509
dc.subject.disciplines Condensed Matter Physics
dc.title Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR
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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