The local structure of the Ca0.9Pr0.1Fe2As2 superconductor as a function of temperature

E. Paris, T. Wakita, L. Simonelli, C. Marini, W. Olszewski, K. Terashima, F. Stramaglia, G. M. Pugliese, Takashi Mizokawa, S. Ioka, K. Kudo, M. Nohara, T. Yokoya, N. L. Saini

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Abstract

We have studied the local structure of Ca0.9Pr0.1Fe2As2, showing filamentary superconductivity above 40 K, by a combined analysis of Fe K-edge and As K-edge extended X-ray absorption fine structure measurements. The experiments are performed as a function of temperature exploiting a single crystal sample and in-plane polarization of the X-ray beam to extract information on the directional displacements. The local structure of the FeAs layer is found to be consistent with a regular FeAs4 tetrahedron containing negligible local disorder. Unlike other superconducting systems, we do not find any change in the atomic displacements across the superconducting transition temperature. The results are compatible with electron doping induced intrinsic superconductivity of optimized FeAs4 local structure containing negligible disorder.

Original languageEnglish
Article number095001
JournalSuperconductor Science and Technology
Volume32
Issue number9
DOIs
Publication statusPublished - 2019 Jul 19

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Keywords

  • filamentary superconductivity
  • high transition temperature
  • Iron-based superconductivity
  • local structure

ASJC Scopus subject areas

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

Cite this

Paris, E., Wakita, T., Simonelli, L., Marini, C., Olszewski, W., Terashima, K., Stramaglia, F., Pugliese, G. M., Mizokawa, T., Ioka, S., Kudo, K., Nohara, M., Yokoya, T., & Saini, N. L. (2019). The local structure of the Ca0.9Pr0.1Fe2As2 superconductor as a function of temperature. Superconductor Science and Technology, 32(9), [095001]. https://doi.org/10.1088/1361-6668/ab2792