Phenomenological model of longitudinal spin fluctuations in itinerant antiferromagnets

被引：4

作者：

Solontsov, A. ^{[1
,2
,3
]}

Antropov, V. P. ^{[1
]}

机构：

[1] US DOE, Ames Lab, Ames, IA 50011 USA

[2] AA Bochvar Inorgan Mat Res Inst, Moscow 123060, Russia

[3] State Ctr Condensed Matter Phys, Moscow 155569, Russia

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 10期

基金：

俄罗斯基础研究基金会;

关键词：

ELECTRON FERROMAGNETS; MAGNETIC FLUCTUATIONS; CRITICAL DYNAMICS; T-C; EXCITATIONS;

D O I：

10.1103/PhysRevB.81.104403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present the phenomenological analysis of the spectrum of longitudinal spin fluctuations in isotropic itinerant electron antiferromagnets with account of spin anharmonicity giving rise to coupling of transverse and longitudinal normal modes. The spectrum consists of a quasielastic part forming a central peak or a dip, depending on temperature and the Landau relaxation rate. Effects of spin-fluctuation coupling also give rise to an inelastic part of the spectrum which has a form of resonances or antiresonances near the magnon frequencies related to nonpropagating longitudinal excitations.

引用

页数：7

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