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

P. Wiecki, V. Taufour, D. Y. Chung, Mercouri G Kanatzidis, S. L. Bud'Ko, P. C. Canfield, Y. Furukawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present the results of As75 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 orbital-derived 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 AFe2As2 (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.

Original languageEnglish
Article number064509
JournalPhysical Review B
Volume97
Issue number6
DOIs
Publication statusPublished - Feb 13 2018

Fingerprint

Nuclear quadrupole resonance
incoherence
nuclear quadrupole resonance
pressure dependence
crossovers
Nuclear magnetic resonance
temperature dependence
nuclear magnetic resonance
electrical resistivity
critical pressure
spin-lattice relaxation
nuclear spin
Temperature
relaxation time
transition temperature
anomalies
slopes
moments
modulation
orbitals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As 75 -NMR/NQR. / Wiecki, P.; Taufour, V.; Chung, D. Y.; Kanatzidis, Mercouri G; Bud'Ko, S. L.; Canfield, P. C.; Furukawa, Y.

In: Physical Review B, Vol. 97, No. 6, 064509, 13.02.2018.

Research output: Contribution to journalArticle

Wiecki, P. ; Taufour, V. ; Chung, D. Y. ; Kanatzidis, Mercouri G ; Bud'Ko, S. L. ; Canfield, P. C. ; Furukawa, Y. / Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As 75 -NMR/NQR. In: Physical Review B. 2018 ; Vol. 97, No. 6.
@article{edf0ebfb62394fe48d6b433744f726e1,
title = "Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As 75 -NMR/NQR",
abstract = "We present the results of As75 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 orbital-derived 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 AFe2As2 (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.",
author = "P. Wiecki and V. Taufour and Chung, {D. Y.} and Kanatzidis, {Mercouri G} and Bud'Ko, {S. L.} and Canfield, {P. C.} and Y. Furukawa",
year = "2018",
month = "2",
day = "13",
doi = "10.1103/PhysRevB.97.064509",
language = "English",
volume = "97",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "6",

}

TY - JOUR

T1 - Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As 75 -NMR/NQR

AU - Wiecki, P.

AU - Taufour, V.

AU - Chung, D. Y.

AU - Kanatzidis, Mercouri G

AU - Bud'Ko, S. L.

AU - Canfield, P. C.

AU - Furukawa, Y.

PY - 2018/2/13

Y1 - 2018/2/13

N2 - We present the results of As75 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 orbital-derived 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 AFe2As2 (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.

AB - We present the results of As75 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 orbital-derived 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 AFe2As2 (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.

UR - http://www.scopus.com/inward/record.url?scp=85042166479&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042166479&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.97.064509

DO - 10.1103/PhysRevB.97.064509

M3 - Article

VL - 97

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 6

M1 - 064509

ER -