Pressure Dependence of Coherence-Incoherence Crossover Behavior in KFe2As2 Observed by Resistivity and 75As-NMR/NQR.

Wiecki, P.; Taufour, V.; Chung, D. Y.; Kanatzidis, M. G.; Bud'ko, S. L.; Canfield, P. C.; Furukawa, Y.

doi:10.1103/PhysRevB.97.064509

Title: Pressure Dependence of Coherence-Incoherence Crossover Behavior in KFe₂As₂ Observed by Resistivity and ⁷⁵As-NMR/NQR.

Journal Article · Tue Feb 13 00:00:00 EST 2018 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.97.064509· OSTI ID:1425286

Wiecki, P.; Taufour, V.; Chung, D. Y.; Kanatzidis, M. G.; Bud'ko, S. L.; Canfield, P. C.; Furukawa, Y.

We present the results of ⁷⁵As nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), and resistivity measurements in KFe₂As₂ under pressure (p). The temperature dependence of the NMR shift, nuclear spin-lattice relaxation time (T1), 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 3d orbitalderived bands with the itinerant electron bands. No anomaly in T * is seen at the critical pressure pc = 1.8 GPa where a change of slope of the superconducting (SC) transition temperature Tc(p) has been observed. In contrast, Tc(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 KFe₂As₂ (A = K, Rb, Cs) family. In the superconducting state, two T1 components are observed at low temperatures, suggesting the existence of two distinct local electronic environments. The temperature dependence of the short T1s indicates a nearly gapless state below Tc. On the other hand, the temperature dependence of the long component 1/T1L 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1425286

Journal Information:: Physical Review, B: Condensed Matter, Vol. 97, Issue 6; ISSN 0163-1829

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Pressure Dependence of Coherence-Incoherence Crossover Behavior in KFe₂As₂ Observed by Resistivity and ⁷⁵As-NMR/NQR.