Effective Hamiltonian for an extended Kondo-lattice model and a possible origin of charge ordering in half-doped manganites

被引：16

作者：

Shen, SQ ^{[1
]}

Wang, ZD ^{[1
]}

机构：

[1] Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.59.14484

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An effective Hamiltonian is derived in the case of the strong Hund coupling and on-site Coulomb interaction by means of a projective perturbation approach. A physical mechanism for charge ordering in half-doped manganites (R0.5X0.5MnO3) is proposed. The virtual process of electron hopping results in antiferromagnetic superexchange and a repulsive interaction, which may drive electrons to form a Wiener lattice. The phase diagram of the ground state of the model is presented at half doping. In the case of formation of a Wigner lattice, we prove that spins of electrons are aligned ferromagnetically as well as that the localized spin background is antiferromagnetic. The influence of the on-site Coulomb interaction is also discussed. [S0163-1829(99)01621-5].

引用

收藏

页码：14484 / 14488

页数：5

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