Metallic versus insulating behavior in the A-site ordered perovskite oxides ACu3Co4O12 (A = Ca and Y) controlled by Mott and Zhang-Rice physics

被引：53

作者：

Mizokawa, Takashi ^{[1
,2
]}

Morita, Yosuke ^{[1
,2
]}

Sudayama, Takaaki ^{[1
,2
]}

Takubo, Kou ^{[1
,2
]}

Yamada, Ikuya ^{[3
]}

Azuma, Masaki ^{[3
]}

Takano, Mikio ^{[3
]}

Shimakawa, Yuichi ^{[3
]}

机构：

[1] Univ Tokyo, Dept Phys, Chiba 2278561, Japan

[2] Univ Tokyo, Dept Complex Sci & Engn, Chiba 2278561, Japan

[3] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 12期

基金：

日本学术振兴会;

关键词：

RAY-ABSORPTION SPECTROSCOPY; HIGH-DIELECTRIC-CONSTANT; ELECTRONIC-STRUCTURE; CHARGE-TRANSFER; PHOTOEMISSION;

D O I：

10.1103/PhysRevB.80.125105

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on a photoemssion study of A-site ordered perovskite oxides ACu(3)Co(4)O(12) (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 d(9)L configuration (L: an O 2p 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 d(6) configuration consistent with its insulating behavior.

引用

页数：4

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