Metallic versus insulating behavior in the A -site ordered perovskite oxides A Cu3 Co4 O12 (A=Ca and Y) controlled by Mott and Zhang-Rice physics

Takashi Mizokawa*, Yosuke Morita, Takaaki Sudayama, Kou Takubo, Ikuya Yamada, Masaki Azuma, Mikio Takano, Yuichi Shimakawa

*この研究の対応する著者

研究成果: Article査読

43 被引用数 (Scopus)

抄録

We report on a photoemssion study of A -site ordered perovskite oxides A Cu3 Co4 O12 (A=Ca and Y) which are metallic for A=Ca and insulating for A=Y. If the Cu valence is +2 as stabilized by the square planar coordination, the Co valence for A=Ca is formally +4 and the system could be a Mott insulator while that for A=Y should be +3.75 and the system is a doped Mott insulator. The photoemission study reveals that the Cu valence for A=Ca and Y is formally +3 with the d9 L configuration (L: an O2p hole) which corresponds to the Zhang-Rice singlet state. In addition, it is found that the Co valence for A=Y is formally +3 with the low-spin d6 configuration consistent with its insulating behavior.

本文言語English
論文番号125105
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
80
12
DOI
出版ステータスPublished - 2009 9 8
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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