Hydrodynamic relation in a two-dimensional Heisenberg antiferromagnet in a field

被引：16

作者：

Chernyshev, A. L. ^{[1
,2
]}

Zhitomirsky, M. E. ^{[3
]}

机构：

[1] Univ Calif Irvine, Dept Phys, Irvine, CA 92697 USA

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[3] DSM INAC SPSMS, Commissariat Energie Atom, F-38054 Grenoble, France

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 17期

关键词：

antiferromagnetism; Heisenberg model; magnetic susceptibility; magnons; ZERO-TEMPERATURE; STIFFNESS;

D O I：

10.1103/PhysRevB.79.174402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin stiffness rho(s) of a two-dimensional (2D) Heisenberg antiferromagnet depends nonanalytically on external magnetic field. We demonstrate that the hydrodynamic relation between rho(s), the uniform susceptibility chi, and the spin-wave velocity c is not violated by such a behavior because similar nonanalytic terms from all three quantities mutually cancel out. In this work, explicit expressions for the field-dependent spin stiffness and for the magnon velocity of the 2D square-lattice antiferromagnet are obtained by direct calculation to order 1/S and in the whole range of magnetic fields.

引用

页数：5

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