Orbital ordering in a two-dimensional triangular lattice

被引：195

作者：

Pen, HF

vandenBrink, J

Khomskii, DI

Sawatzky, GA

机构：

[1] Laboratory of Applied and Solid State Physics, Materials Science Centre, University of Groningen, Groningen, 9747 AG

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.78.1323

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We discuss the role of orbital ordering in a two-dimensional triangular lattice. Usually, this lattice is considered as ''frustrated.'' We show that a peculiar type of orbital ordering can remove this frustration if we allow for orbital degeneracy. Wt: pay special attention to the d(2) case, for which we present mean field calculations for possible orbital orderings and an exact diagonalization study of a three-site cluster within a degenerate Hubbard model. The results support the possibility of an orbitally ordered singlet ground state. In particular, it provides new insight to the magnetic phase transition and the low temperature phase of LiVO2.

引用

页码：1323 / 1326

页数：4

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