The effect of RE substitution in layered REO<inf>0.5</inf>F<inf>0.5</inf>BiS<inf>2</inf> Chemical pressure, local disorder and superconductivity

Y. Mizuguchi, E. Paris, T. Sugimoto, A. Iadecola, J. Kajitani, O. Miura, Takashi Mizokawa, N. L. Saini

    Research output: Contribution to journalArticle

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    Abstract

    We have studied the effect of RE substitution on the structure and the local atomic disorder in REO<inf>0.5</inf>F<inf>0.5</inf>BiS<inf>2</inf> (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 Ce<inf>1-x</inf>Nd<inf>x</inf>O<inf>0.5</inf>F<inf>0.5</inf>BiS<inf>2</inf> and Nd<inf>1-y</inf>Sm<inf>y</inf>O<inf>0.5</inf>F<inf>0.5</inf>BiS<inf>2</inf>. 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 L<inf>3</inf>-edge extended X-ray absorption fine structure (EXAFS) measurements are performed to investigate local displacements in the BiS<inf>2</inf> 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 REO<inf>0.5</inf>F<inf>0.5</inf>BiS<inf>2</inf> 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 6p<inf>x</inf>/6p<inf>y</inf> electrons.

    Original languageEnglish
    Pages (from-to)22090-22096
    Number of pages7
    JournalPhysical Chemistry Chemical Physics
    Volume17
    Issue number34
    DOIs
    Publication statusPublished - 2015 Jul 20

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    Superconductivity
    Substitution reactions
    superconductivity
    disorders
    substitutes
    X ray absorption
    Electronic states
    shrinkage
    Rare earths
    elongation
    Lattice constants
    Elongation
    lattice parameters
    rare earth elements
    fine structure
    expansion
    Electrons
    electronics
    electrons
    x rays

    ASJC Scopus subject areas

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

    Cite this

    The effect of RE substitution in layered REO<inf>0.5</inf>F<inf>0.5</inf>BiS<inf>2</inf> Chemical pressure, local disorder and superconductivity. / Mizuguchi, Y.; Paris, E.; Sugimoto, T.; Iadecola, A.; Kajitani, J.; Miura, O.; Mizokawa, Takashi; Saini, N. L.

    In: Physical Chemistry Chemical Physics, Vol. 17, No. 34, 20.07.2015, p. 22090-22096.

    Research output: Contribution to journalArticle

    Mizuguchi, Y. ; Paris, E. ; Sugimoto, T. ; Iadecola, A. ; Kajitani, J. ; Miura, O. ; Mizokawa, Takashi ; Saini, N. L. / The effect of RE substitution in layered REO<inf>0.5</inf>F<inf>0.5</inf>BiS<inf>2</inf> Chemical pressure, local disorder and superconductivity. In: Physical Chemistry Chemical Physics. 2015 ; Vol. 17, No. 34. pp. 22090-22096.
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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.",
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    AU - Iadecola, A.

    AU - Kajitani, J.

    AU - Miura, O.

    AU - Mizokawa, Takashi

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