Anomalous temperature dependence of the superfluid density caused by a dirty-to-clean crossover in superconducting FeSe0.4Te0.6 single crystals

Hideyuki Takahashi, Yoshinori Imai, Seiki Komiya, Ichiro Tsukada, Atsutaka Maeda

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number132503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number13
DOIs
Publication statusPublished - 2011 Oct 18
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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