Quadrupolar order in the S = 2 Heisenberg ferromagnet with the single-ion cubic anisotropy

被引：0

作者：

Dudzinski, M ^{[1
]}

Sznajd, J ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw 2, Poland

来源：

EUROPEAN PHYSICAL JOURNAL B | 1998年 / 5卷 / 03期

关键词：

D O I：

10.1007/s100510050498

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The ground slate properties of S = 2 ferromagnets with isotropic Heisenberg exchange (J) and single-ion cubic anisotropy (D) are studied. The perturbation theory for J/D much less than 1 is used to find an effective Hamiltonian up to the fourth order for 1, 2 and 3 dimensions. It is shown that in opposition to the MFA prediction there is the quadrupolar long range order at T = 0 in the non-magnetic state of the system without a quadrupolar type of interaction. The effect is a consequence of the quantum nature of the model.

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页码：745 / 750

页数：6

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