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

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

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish
Article number132410
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number13
DOIs
Publication statusPublished - 2004 Apr
Externally publishedYes

Fingerprint

Metal insulator transition
Absorption spectroscopy
x ray absorption
x ray spectroscopy
absorption spectroscopy
insulators
X rays
orbitals
Hysteresis
hysteresis
metals
Heating
Temperature
heating
temperature
Electrons
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Orbital state and metal-insulator transition in Ca2-xSr xRuO4 (x=0.0 and 0.09) studied by x-ray absorption spectroscopy. / Mizokawa, Takashi; Tjeng, L. H.; Lin, H. J.; Chen, C. T.; Schuppler, S.; Nakatsuji, S.; Fukazawa, H.; Maeno, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 69, No. 13, 132410, 04.2004.

Research output: Contribution to journalArticle

Mizokawa, Takashi ; Tjeng, L. H. ; Lin, H. J. ; Chen, C. T. ; Schuppler, S. ; Nakatsuji, S. ; Fukazawa, H. ; Maeno, Y. / Orbital state and metal-insulator transition in Ca2-xSr xRuO4 (x=0.0 and 0.09) studied by x-ray absorption spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2004 ; Vol. 69, No. 13.
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