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Issue 34, 2015
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The effect of RE substitution in layered REO0.5F0.5BiS2: chemical pressure, local disorder and superconductivity

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Abstract

We have studied the effect of RE substitution on the structure and the local atomic disorder in REO0.5F0.5BiS2 (RE = rare-earth) to understand their correlation with the bulk superconductivity in these materials. The mean RE size, affecting the chemical pressure, has been varied in two series namely Ce1−xNdxO0.5F0.5BiS2 and Nd1−ySmyO0.5F0.5BiS2. The lattice parameters evolve anomalously, showing an anisotropic shrinkage (elongation) of the c-axis (a-axis) to an isotropic expansion of the lattice with increasing mean RE size. The Bi L3-edge extended X-ray absorption fine structure (EXAFS) measurements are performed to investigate local displacements in the BiS2 lattice, revealing a large disorder and a sharp boundary between the Ce-containing and Sm-containing series with a distinct local structure. The results suggest that the bulk superconductivity in REO0.5F0.5BiS2 is correlated with anomalous atomic displacements in the Bi–S1 network, likely to be a combined effect of active Bi 6s electronic states and a possible Jahn–Teller-like instability of the Bi 6px/6py electrons.

Graphical abstract: The effect of RE substitution in layered REO0.5F0.5BiS2: chemical pressure, local disorder and superconductivity

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Article information


Submitted
29 Jun 2015
Accepted
20 Jul 2015
First published
21 Jul 2015

Phys. Chem. Chem. Phys., 2015,17, 22090-22096
Article type
Paper

The effect of RE substitution in layered REO0.5F0.5BiS2: chemical pressure, local disorder and superconductivity

Y. Mizuguchi, E. Paris, T. Sugimoto, A. Iadecola, J. Kajitani, O. Miura, T. Mizokawa and N. L. Saini, Phys. Chem. Chem. Phys., 2015, 17, 22090
DOI: 10.1039/C5CP03750F

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