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
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.
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页码:13325 / 13328
页数:4
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