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標題:The effect of orbital-lattice coupling on the electrical resistivity of YBaCuFeO5 investigated by X-ray absorption
學年108
學期1
出版(發表)日期2019/12/01
作品名稱The effect of orbital-lattice coupling on the electrical resistivity of YBaCuFeO5 investigated by X-ray absorption
作品名稱(其他語言)
著者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
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出版者
著錄名稱、卷期、頁數Scientific Reports , Volume 9, 論文編號18586
摘要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.
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語言英文
ISSN2045-2322
期刊性質國外
收錄於SCI;
產學合作
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國別英國
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