SPIN EXCITATIONS IN A QUANTUM ANTIFERROMAGNET WITH MAGNETIC-IMPURITIES AND VACANCIES

被引：25

作者：

BRENIG, W

KAMPF, AP

机构：

[1] Department of Physics, University of California at Santa Barbara, Santa Barbara

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.43.12914

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The two-dimensional antiferromagnetic spin-1/2 Heisenberg model on a square lattice is considered in the presence of randomly distributed vacancies and magnetic impurities. We calculate the configurationally averaged spin excitations of the system in the limit of small impurity concentrations. We apply linear spin-wave theory to the host and use the exact T matrix for the impurity sites. Results for the spin-wave spectrum are presented. These include resonant scattering effects, the renormalized spin-wave dispersion, and the spin-wave damping.

引用

页码：12914 / 12920

页数：7

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