MACROSCOPIC QUANTUM COHERENCE IN SMALL ANTIFERROMAGNETIC PARTICLES

被引：29

作者：

DUAN, JM ^{[1
]}

GARG, A ^{[1
]}

机构：

[1] NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1995年 / 7卷 / 10期

关键词：

D O I：

10.1088/0953-8984/7/10/023

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The Neel vector of a small antiferromagnetic particle can resonate between degenerate directions. The total moment of the particle will generally be non-zero, and this resonance cannot then occur without transverse anisotropy. Previous work is extended to include such anisotropy via a two-spin model representing the two sublattice moments. The WKB exponent in the tunnel splitting is found exactly when the sublattice moments are equal, and by a variational method that holds over the entire parameter space when the moments are unequal.

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页码：2171 / 2181

页数：11

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