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, Takanobu Kiss, A. Ichinose, Masashi Mukaida, L. Civale

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Abstract

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.

Original languageEnglish
Article number044005
JournalSuperconductor Science and Technology
Volume27
Issue number4
DOIs
Publication statusPublished - Jan 1 2014

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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    Maiorov, B., Mele, P., Baily, S. A., Weigand, M., Lin, S. Z., Balakirev, F. F., Matsumoto, K., Nagayoshi, H., Fujita, S., Yoshida, Y., Ichino, Y., Kiss, T., Ichinose, A., Mukaida, M., & Civale, L. (2014). Inversion of the upper critical field anisotropy in FeTeS films. Superconductor Science and Technology, 27(4), [044005]. https://doi.org/10.1088/0953-2048/27/4/044005