Magnetic penetration depth and flux-flow resistivity measurements on NaFe0.97Co0.03As single crystals

T. Okada, H. Takahashi, Y. Imai, K. Kitagawa, K. Matsubayashi, Y. Uwatoko, A. Maeda

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We measured the surface impedance of NaFe1-xCoxAs (x ≈ 0.03, optimally doped) single crystals under finite magnetic fields. At low temperatures (T < 0.5Tc), the penetration depth of these crystals was increased as λ(T) - λ(0) = A × Tn with an exponent n ≈ 2, indicating the realization of the gapless superconductivity. The flux-flow resistivity, ρf, behaved similarly to the Bardeen-Stephen prediction, ρfn = B/B c2. However, the electronic state inside the vortex core was not so dirty. By comparing the results with those of LiFeAs1-xPx and SrFe2(As0.7P0.3)2, it has been clarified that the gap anisotropy dominates the gradient of ρf(B) .

Original languageEnglish
Pages (from-to)109-112
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume494
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Flux-flow resistivity
  • Iron-based superconductor
  • Microwave surface impedance
  • Na(Fe,Co)As
  • Single crystal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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