SURFACE-PROPERTIES OF PEROVSKITE ANTIFERROMAGNETS - SPECTRUM OF SPIN-WAVES AND IMPURITY MODES

被引：11
|
作者：
PACZEK, ID
CHEN, NN
COTTAM, MG
机构：
[1] Physics Department, University of Western Ontario, London, Ontario
来源：
PHYSICAL REVIEW B | 1992年 / 45卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.45.12898
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Analytic expressions for the Green functions for semi-infinite antiferromagnets with the perovskite structure are derived in a low-temperature spin-wave approximation. The results are applied to the calculation of spectral intensities for the surface spin-waves modes. Also the effects of an isolated magnetic impurity on the excitation spectrum of a semi-infinite Heisenberg antiferromagnet are studied by extending the Green-function analysis. The influence of the bulk and surface spin waves on the impurity-mode energies is obtained, and the theory is applied to several perovskite-structure antiferromagnets.
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页码：12898 / 12904
页数：7
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