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

TitlePressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As-75-NMR/NQR
Publication TypeJournal Article
Year of Publication2018
AuthorsWiecki, P, Taufour, V, Chung, DY, Kanatzidis, MG, Bud'ko, SL, Canfield, PC, Furukawa, Y
JournalPhysical Review B
Volume97
Pagination064509
Date Published02
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000424900500002
Keywordsiron-based superconductors, magnetic-resonance, metals, order, physics, t-c, temperature superconductivity
Abstract

aly 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/T1 data, although such a correlation cannot be seen in the replacement effects of A in the AFe(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-1s indicates a nearly gapless state below T-c. On the other hand, the temperature dependence of the long component 1/T-1L 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 KFe2As2 under pressure.

DOI10.1103/PhysRevB.97.064509
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