Exceptional suppression of flux-flow resistivity in FeSe0.4Te0.6 by back-flow from excess Fe atoms and Se/Te substitutions

Tatsunori Okada, Fuyuki Nabeshima, Hideyuki Takahashi, Yoshinori Imai, Atsutaka Maeda

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We measured the microwave surface impedance of FeSe0.4Te0.6 single crystals with and without external magnetic fields. The superfluid density exhibited a quadratic temperature dependence, indicating a strong pair-breaking effect. The flux-flow resistivity behaved as ρf(B<Bc2)/ρn=αB/Bc2. The observed α value of ≈0.66 was considerably smaller than that of other Fe-based materials (α≥1) and was attributed to a back-flow of superfluids remarkable in disordered superconductors. This is an observation of the back-flow phenomenon caused by an origin other than the vortex pinning in multiple-band systems.

Original languageEnglish
Article number054510
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number5
DOIs
Publication statusPublished - 2015 Feb 11
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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