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

研究成果: Article査読

15 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号054510
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
91
5
DOI
出版ステータスPublished - 2015 2月 11
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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