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

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 s...

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Bibliographic Details
Published in:Superconductor science & technology 2019-07, Vol.32 (9)
Main Authors: 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
Format: Article
Language:English
Subjects:
filamentary superconductivity
high transition temperature
iron-based superconductivity
local structure
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Summary: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.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/ab2792