A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor

M. Y. Hacisalihoglu, E. Paris, B. Joseph, L. Simonelli, T. J. Sato, T. Mizokawa, N. L. Saini*

*この研究の対応する著者

研究成果: Article査読

8 被引用数 (Scopus)

抄録

We have studied the local structure of a Ba(Fe1-xCox)2As2 superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (Tc). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across Tc, indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs4. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe1-xCox)2As2 pnictides.

本文言語English
ページ(範囲)9029-9035
ページ数7
ジャーナルPhysical Chemistry Chemical Physics
18
13
DOI
出版ステータスPublished - 2016 4 7

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

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「A study of temperature dependent local atomic displacements in a Ba(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>2</sub>As<sub>2</sub> superconductor」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。

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