TY - JOUR
T1 - Anomalous temperature dependence of the superfluid density caused by a dirty-to-clean crossover in superconducting FeSe0.4Te0.6 single crystals
AU - Takahashi, Hideyuki
AU - Imai, Yoshinori
AU - Komiya, Seiki
AU - Tsukada, Ichiro
AU - Maeda, Atsutaka
PY - 2011/10/18
Y1 - 2011/10/18
N2 - We report microwave surface impedances of FeSe0.4Te 0.6 single crystals measured at 12, 19, and 44 GHz. The penetration depth exhibits a power-law behavior, δλL= λL(T)-λL(0) CTn with an exponent n2, which is considered to result from impurity scattering. The temperature dependence of the superfluid density largely deviates from the behavior expected in the BCS theory. We believe that this deviation is caused by the crossover from the dirty regime near Tc to the clean regime at low temperatures, which is supported by the rapid increase of the quasiparticle scattering time obtained from the microwave conductivity. We also believe that the previously published data of the superfluid density can be interpreted in this scenario.
AB - We report microwave surface impedances of FeSe0.4Te 0.6 single crystals measured at 12, 19, and 44 GHz. The penetration depth exhibits a power-law behavior, δλL= λL(T)-λL(0) CTn with an exponent n2, which is considered to result from impurity scattering. The temperature dependence of the superfluid density largely deviates from the behavior expected in the BCS theory. We believe that this deviation is caused by the crossover from the dirty regime near Tc to the clean regime at low temperatures, which is supported by the rapid increase of the quasiparticle scattering time obtained from the microwave conductivity. We also believe that the previously published data of the superfluid density can be interpreted in this scenario.
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U2 - 10.1103/PhysRevB.84.132503
DO - 10.1103/PhysRevB.84.132503
M3 - Article
AN - SCOPUS:80155211766
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 13
M1 - 132503
ER -