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

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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
Pages (from-to)132410-1-132410-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number13
DOIs
Publication statusPublished - 2004 Apr 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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