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The effect of orbital-lattice coupling on the electrical resistivity of YBaCuFeO5 investigated by X-ray absorption.
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; Lai, Y C; Tsai, H M; Pao, C W; Lin, H J; Lee, J F; Asokan, K; Pong, W F.
Afiliación
  • Srivastava MK; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Qiu XS; Department of Physics, Banasthali Vidyapith, Rajasthan, 304022, India.
  • Chin YY; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Hsieh SH; Department of Physics, National Chung Cheng University, Chiayi, 621, Taiwan.
  • Shao YC; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Liang YH; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Lai CH; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Du CH; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Wang HT; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Chiou JW; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Lai YC; Department of Physics, Tamkang University, Tamsui, 251, Taiwan.
  • Tsai HM; Department of Physics, National Tsinghua University, Hsinchu, 300, Taiwan.
  • Pao CW; Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 811, Taiwan.
  • Lin HJ; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Lee JF; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Asokan K; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
  • Pong WF; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
Sci Rep ; 9(1): 18586, 2019 Dec 09.
Article en En | MEDLINE | ID: mdl-31819082
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 [Formula: see text] orbital at high temperature (300-150 K) to the [Formula: see text] 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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2019 Tipo del documento: Article País de afiliación: Taiwán Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2019 Tipo del documento: Article País de afiliación: Taiwán Pais de publicación: Reino Unido