Spin-driven Jahn-Teller distortion in a pyrochlore system

被引：236

作者：

Yamashita, Y ^{[1
]}

Ueda, K ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.85.4960

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ground-state properties of the spin-1 antiferromagnetic Heisenberg model on the comer-sharing tetrahedra, the pyrochlore lattice, are investigated. By breaking up each spin into a pair of 1/2-spins, the problem is reduced to the equivalent one of the spin-1/2 tetrahedral network in analogy with the valence bond solid state in one dimension. The twofold degeneracy of the spin singlets of a tetrahedron is lifted by a Jahn-Teller mechanism, leading to a cubic to tetragonal structural transition, it is proposed that the present mechanism is responsible for the phase transition observed in the spin-1 spinel compounds ZnV2O4 and MgV2O4.

引用

页码：4960 / 4963

页数：4

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