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, Takashi Mizokawa, N. L. Saini

    Research output: Contribution to journalArticle

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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.

    Original languageEnglish
    Pages (from-to)9029-9035
    Number of pages7
    JournalPhysical Chemistry Chemical Physics
    Volume18
    Issue number13
    DOIs
    Publication statusPublished - 2016 Apr 7

    Fingerprint

    X ray absorption
    Superconducting materials
    fine structure
    disorders
    Group 5A compounds
    x rays
    Superconductivity
    tetrahedrons
    Temperature
    sublattices
    cuprates
    temperature
    superconductivity
    transition temperature
    Single crystals
    anomalies
    single crystals

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Physics and Astronomy(all)

    Cite this

    A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor. / Hacisalihoglu, M. Y.; Paris, E.; Joseph, B.; Simonelli, L.; Sato, T. J.; Mizokawa, Takashi; Saini, N. L.

    In: Physical Chemistry Chemical Physics, Vol. 18, No. 13, 07.04.2016, p. 9029-9035.

    Research output: Contribution to journalArticle

    Hacisalihoglu, MY, Paris, E, Joseph, B, Simonelli, L, Sato, TJ, Mizokawa, T & Saini, NL 2016, 'A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor', Physical Chemistry Chemical Physics, vol. 18, no. 13, pp. 9029-9035. https://doi.org/10.1039/c5cp07985c
    Hacisalihoglu, M. Y. ; Paris, E. ; Joseph, B. ; Simonelli, L. ; Sato, T. J. ; Mizokawa, Takashi ; Saini, N. L. / A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor. In: Physical Chemistry Chemical Physics. 2016 ; Vol. 18, No. 13. pp. 9029-9035.
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