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    Title: The effect of orbital-lattice coupling on the electrical resistivity of YBaCuFeO5 investigated by X-ray absorption
    Authors: Srivastava, M. K.;Qiu, X.-S.;Chin, Y. Y.;Hsieh, S. H.;Shao, Y. C.;Liang, Y.-H.;Lai, C.-H.;Du, C. H.;Wang, H. T.;Chiou, J. W.;Y. C. Lai, H. M. Tsai;Pao, C. W.;Lin, H. J.;Lee, J. F.;Asokan, K.;Pong, W. F.
    Date: 2019-12-09
    Issue Date: 2020-07-14 12:10:22 (UTC+8)
    Publisher: Nature Publishing Group
    Abstract: Article
    Open Access
    Published: 09 December 2019
    The effect of orbital-lattice coupling on the electrical resistivity of YBaCuFeO5 investigated by X-ray absorption
    M. K. Srivastava, X.-S. Qiu, Y. Y. Chin, S. H. Hsieh, Y. C. Shao, Y.-H. Liang, C.-H. Lai, C. H. Du, H. T. Wang, J. W. Chiou, Y. C. Lai, H. M. Tsai, C. W. Pao, H. J. Lin, J. F. Lee, K. Asokan & W. F. Pong
    Scientific Reports volume 9, Article number: 18586 (2019) Cite this article

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    Abstract
    Temperature-dependent X-ray absorption near-edge structures, X-ray linear dichroism (XLD) and extended X-ray absorption fine structure (EXAFS) spectroscopic techniques were used to investigate the valence state, preferred orbital and local atomic structure that significantly affect the electrical and magnetic properties of a single crystal of YBaCuFeO5 (YBCFO). An onset of increase of resistivity at ~180 K, followed by a rapid increase at/below 125 K, is observed. An antiferromagnetic (AFM)-like transition is close to the temperature at which the resistivity starts to increase in the ab-plane and is also observed with strong anisotropy between the ab-plane and the c-axis. The XLD spectra at the Fe L3,2-edge revealed a change in Fe 3d eg holes from the preferential 3dx2−y2 orbital at high temperature (300–150 K) to the 3d3z2−r2 orbital at/below 125 K. The analysis of the Fe K-edge EXAFS data of YBCFO further revealed an unusual increase in the Debye-Waller factor of the nearest-neighbor Fe-O bond length at/below 125 K, suggesting phonon-softening behavior, resulting in the breaking of lattice symmetry, particularly in the ab-plane of Fe-related square pyramids. These findings demonstrate a close correlation between electrical resistivity and coupling of the preferred Fe 3d orbital with lattice distortion of a single crystal of YBCFO.
    Relation: Scientific Reports 9, 18586
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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