Valence fluctuations and correlated metallic states in A -site ordered perovskite oxides ACu3V4O12 ( A=Na, Ca, and Y)

Yosuke Morita*, Takaaki Sudayama, Kou Takubo, Hiroshi Shiraki, Takashi Saito, Yuichi Shimakawa, Takashi Mizokawa

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

We have studied the electronic structure of A -site ordered perovskite oxides ACu3V4O12 (A=Na, Ca, and Y) using photoemission spectroscopy. V and Cu valence fluctuations are clearly observed in the V2p and the Cu2p core-level spectra. In going from A=Na to Ca to Y, electrons doped by the A -site substitution are mainly captured by the Cu site which has a mixture of +2 (d9) and +3 (d9 L, L is an O2p hole) and are partly distributed into the V site. The photoemission spectra near the Fermi level show a systematic change induced by the A -site substitution. The electronic structure of ACu3V4O12 is very different from that in Ca1-xSrxVO3 due to the existence of the Cu 3d electrons, and the unusual correlation effect in ACu 3V4O12 can be related to the valence fluctuations observed in the core-level spectra.

本文言語English
論文番号165111
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
81
16
DOI
出版ステータスPublished - 2010 4月 20
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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