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- Title
The effect of orbital-lattice coupling on the electrical resistivity of YBaCuFeO<sub>5</sub> 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.; Lai, Y. C.; Tsai, H. M.; Pao, C. W.; Lin, H. J.; Lee, J. F.; Asokan, K.; Pong, W. F.
- 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 3 d x 2 − y 2 orbital at high temperature (300–150 K) to the 3 d 3 z 2 − r 2 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.
- Subjects
ELECTRICAL resistivity; YTTERBIUM compounds; X-ray absorption; ATOMIC structure; ANTIFERROMAGNETISM; SINGLE crystals
- Publication
Scientific Reports, 2019, Vol 9, Issue 1, pN.PAG
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-019-54772-0