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Issue 13, 2016
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A study of temperature dependent local atomic displacements in a Ba(Fe1−xCox)2As2 superconductor

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Abstract

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.

Graphical abstract: A study of temperature dependent local atomic displacements in a Ba(Fe1−xCox)2As2 superconductor

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Publication details

The article was received on 26 Dec 2015, accepted on 24 Feb 2016 and first published on 24 Feb 2016


Article type: Paper
DOI: 10.1039/C5CP07985C
Citation: Phys. Chem. Chem. Phys., 2016,18, 9029-9035
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    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 and N. L. Saini, Phys. Chem. Chem. Phys., 2016, 18, 9029
    DOI: 10.1039/C5CP07985C

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