Metal-insulator transition induced by a spin-state transition in TbBaCo2O5+δ (δ=0.5)

被引：285

作者：

Moritomo, Y ^{[1
]}

Akimoto, T

Takeo, M

Machida, A

Nishibori, E

Takata, M

Sakata, M

Ohoyama, K

Nakamura, A

机构：

[1] Nagoya Univ, CIRSE, Nagoya, Aichi 4648601, Japan

[2] Nagoya Univ, Dept Crystalline Mat Sci, Nagoya, Aichi 4648603, Japan

[3] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

[4] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.61.R13325

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature variation of the crystal structure has been investigated for TbBaCo2O5+delta (delta=0.5), which shows a metal-insulator (MI) transition at T(MI)approximate to 340 K. The compound has an oxygen-deficient perovskite structure, with alternating CoO6 octahedral and CoO5 pyramidal chains along the crystallographic b axis. We have found that both the pyramids and octahedra are significantly distorted in the insulating phase below T-MI, suggesting a d(3x2-r2)/d(3y2-r2)-type orbital ordering.

引用

页码：13325 / 13328

页数：4

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