Absence of collective effects in Heisenberg systems with localized magnetic moments

被引：52

作者：

Illas, F

Moreira, IDR

deGraaf, C

Castell, O

Casanovas, J

机构：

[1] UNIV GRONINGEN,DEPT CHEM PHYS,NL-9747 AG GRONINGEN,NETHERLANDS

[2] UNIV ROVIRA & VIRGILI,DEPT QUIM,TARRAGONA 43005,SPAIN

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.56.5069

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Existence of collective effects in magnetic coupling in ionic solids is studied by mapping spin eigenstates of the Heisenberg and exact nonrelativistic Hamiltonians on cluster models representing KNiF3, K2NiF4, NiO, and La2CuO4. Ab initio techniques are used to estimate the Heisenberg constant J. For clusters with two magnetic centers, the values obtained are about the same for models having more magnetic centers. The absence of collective effects in J strongly suggests that magnetic interactions in this kind of ionic solids are genuinely local and entangle only the two magnetic centers involved.

引用

页码：5069 / 5072

页数：4

共 29 条

[1] MAGNETIC DYNAMICS OF LA2CUO4 AND LA2-XBAXCUO4 [J].