Orbital state and metal-insulator transition in Ca2-xSr xRuO4 (x=0.0 and 0.09) studied by x-ray absorption spectroscopy

T. Mizokawa; L. H. Tjeng; H. J. Lin; C. T. Chen; S. Schuppler; S. Nakatsuji; H. Fukazawa; Y. Maeno

doi:10.1103/PhysRevB.69.132410

Orbital state and metal-insulator transition in Ca_2-xSr _xRuO₄ (x=0.0 and 0.09) studied by x-ray absorption spectroscopy

T. Mizokawa^*, L. H. Tjeng, H. J. Lin, C. T. Chen, S. Schuppler, S. Nakatsuji, H. Fukazawa, Y. Maeno

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The nature of metal-insulator (MI) transition in a t_2g-electron system Ca_2-xSr_xRuO₄ has been investigated using O 1s x-ray absorption spectroscopy (XAS). The O 1s XAS data strongly depend on temperature and demonstrate that the hysteresis of the MI transition is accompanied by the hysteresis of the orbital change. An unrestricted Hartree-Fock analysis indicates that the amount of yz/zx hole is discontinuously reduced at the MI transition. In the insulating phase, the amount of 4d yz/zx hole gradually decreases on heating, suggesting that partial orbital fluctuation increases with temperature.

Original language	English
Article number	132410
Pages (from-to)	132410-1-132410-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	69
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.69.132410
Publication status	Published - 2004 Apr 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Mizokawa, T., Tjeng, L. H., Lin, H. J., Chen, C. T., Schuppler, S., Nakatsuji, S., Fukazawa, H., & Maeno, Y. (2004). Orbital state and metal-insulator transition in Ca_2-xSr _xRuO₄ (x=0.0 and 0.09) studied by x-ray absorption spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 69(13), 132410-1-132410-4. Article 132410. https://doi.org/10.1103/PhysRevB.69.132410

Mizokawa, T, Tjeng, LH, Lin, HJ, Chen, CT, Schuppler, S, Nakatsuji, S, Fukazawa, H & Maeno, Y 2004, 'Orbital state and metal-insulator transition in Ca_2-xSr _xRuO₄ (x=0.0 and 0.09) studied by x-ray absorption spectroscopy', Physical Review B - Condensed Matter and Materials Physics, vol. 69, no. 13, 132410, pp. 132410-1-132410-4. https://doi.org/10.1103/PhysRevB.69.132410

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abstract = "The nature of metal-insulator (MI) transition in a t2g-electron system Ca2-xSrxRuO4 has been investigated using O 1s x-ray absorption spectroscopy (XAS). The O 1s XAS data strongly depend on temperature and demonstrate that the hysteresis of the MI transition is accompanied by the hysteresis of the orbital change. An unrestricted Hartree-Fock analysis indicates that the amount of yz/zx hole is discontinuously reduced at the MI transition. In the insulating phase, the amount of 4d yz/zx hole gradually decreases on heating, suggesting that partial orbital fluctuation increases with temperature.",

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doi = "10.1103/PhysRevB.69.132410",

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T1 - Orbital state and metal-insulator transition in Ca2-xSr xRuO4 (x=0.0 and 0.09) studied by x-ray absorption spectroscopy

AU - Mizokawa, T.

AU - Tjeng, L. H.

AU - Lin, H. J.

AU - Chen, C. T.

AU - Schuppler, S.

AU - Nakatsuji, S.

AU - Fukazawa, H.

AU - Maeno, Y.

PY - 2004/4/1

Y1 - 2004/4/1

N2 - The nature of metal-insulator (MI) transition in a t2g-electron system Ca2-xSrxRuO4 has been investigated using O 1s x-ray absorption spectroscopy (XAS). The O 1s XAS data strongly depend on temperature and demonstrate that the hysteresis of the MI transition is accompanied by the hysteresis of the orbital change. An unrestricted Hartree-Fock analysis indicates that the amount of yz/zx hole is discontinuously reduced at the MI transition. In the insulating phase, the amount of 4d yz/zx hole gradually decreases on heating, suggesting that partial orbital fluctuation increases with temperature.

AB - The nature of metal-insulator (MI) transition in a t2g-electron system Ca2-xSrxRuO4 has been investigated using O 1s x-ray absorption spectroscopy (XAS). The O 1s XAS data strongly depend on temperature and demonstrate that the hysteresis of the MI transition is accompanied by the hysteresis of the orbital change. An unrestricted Hartree-Fock analysis indicates that the amount of yz/zx hole is discontinuously reduced at the MI transition. In the insulating phase, the amount of 4d yz/zx hole gradually decreases on heating, suggesting that partial orbital fluctuation increases with temperature.

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Orbital state and metal-insulator transition in Ca_2-xSr _xRuO₄ (x=0.0 and 0.09) studied by x-ray absorption spectroscopy

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