Orbitally induced Peierls state in spinels

被引：264

作者：

Khomskii, DI ^{[1
]}

Mizokawa, T

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] Univ Groningen, NL-9747 AG Groningen, Netherlands

[3] Univ Tokyo, Dept Phys, Chiba 2778581, Japan

[4] Univ Tokyo, Dept Complex Sci & Engn, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.94.156402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider the superstructures, which can be formed in spinels containing on B sites the transition-metal ions with partially filled t(2g) levels. We show that, when such systems are close to the itinerant state (e.g., have an insulator-metal transition), there may appear in them an orbitally driven Peierls state. We explain by this mechanism the very unusual superstructures observed in CuIr2S4 (octamers) and MgTi2O4 (chiral superstructures) and suggest that a similar phenomenon should be observed in NaTiO2 and possibly in some other systems.

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页数：4

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