Inversion of the upper critical field anisotropy in FeTeS films

B. Maiorov, P. Mele, S. A. Baily, M. Weigand, S. Z. Lin, F. F. Balakirev, K. Matsumoto, H. Nagayoshi, S. Fujita, Y. Yoshida, Y. Ichino, T. Kiss, A. Ichinose, M. Mukaida, L. Civale

研究成果査読

9 被引用数 (Scopus)

抄録

We present the complete superconducting upper critical field (H c2) - temperature (T) diagram of FeTeS films measured at three crystalline orientations (H ∥ c, 45° and ab). We find that Hc2 is almost isotropic in magnetic field orientation with μ0Hc2 (T = 0) ∼ 30 T and a transition temperature of Tc ∼ 7 K. A small but clear Hc2 angular anisotropy is observed, with a crossover around T = 0.7Tc, from Hc2 (∥ c) < Hc2 (∥ ab) for T > 0.7Tc to H c2 (∥ c) > Hc2 (∥ ab) for T < 0.7T c. This change in the anisotropy is similar to that observed in FeTeS and FeTeSe single crystals but occurs at a higher T/Tc for our film. We analyze the Hc2 (T) in terms of pair-breaking mechanisms and two-band superconductor theory. Understanding the inversion of Hc2 opens the possibility to adjust the effective anisotropy of superconductors for different applications.

本文言語English
論文番号044005
ジャーナルSuperconductor Science and Technology
27
4
DOI
出版ステータスPublished - 2014 4
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 凝縮系物理学
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学

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