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, N. L. Saini*

*この研究の対応する著者

研究成果: Article査読

40 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)22090-22096
ページ数7
ジャーナルPhysical Chemistry Chemical Physics
17
34
DOI
出版ステータスPublished - 2015 7 20

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理化学および理論化学

フィンガープリント

「The effect of RE substitution in layered REO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub>: Chemical pressure, local disorder and superconductivity」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル