Band Jahn-Teller instability and formation of valence bond solid in a mixed-valent spinel oxide LiRh2O4

被引：59

作者：

Okamoto, Yoshihiko ^{[2
]}

Niitaka, Seiji ^{[2
]}

Uchida, Masaya ^{[2
]}

Waki, Takeshi ^{[1
]}

Takigawa, Masashi ^{[1
]}

Nakatsu, Yoshitaka ^{[3
]}

Sekiyama, Akira ^{[3
]}

Suga, Shigemasa ^{[3
]}

Arita, Ryotaro ^{[2
]}

Takagi, Hidenori ^{[2
,4
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[2] RIKEN, Wako, Saitama 3510198, Japan

[3] Osaka Univ, Grad Sch Engn Sci, Div Mat Phys, Toyonaka, Osaka 5608531, Japan

[4] Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.101.086404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have synthesized a new spinel oxide LiRh(2)O(4) with a mixed-valent configuration of Rh(3+) and Rh(4+). At room temperature, it is a paramagnetic metal, but on cooling, a metal-insulator transition occurs and a valence bond solid state is formed below 170 K. We argue that the formation of valence bond solid is promoted by a band Jahn-Teller transition at 230 K and the resultant confinement of t(2g) holes within the xy band. The band Jahn-Teller instability is also responsible for the observed enhanced thermoelectric power in the orbital-disordered phase above 230 K.

引用

页数：4

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