FINITE-TEMPERATURE PROPERTIES OF QUANTUM ANTIFERROMAGNETS IN A UNIFORM MAGNETIC-FIELD IN ONE AND 2 DIMENSIONS

被引：173

作者：

SACHDEV, S

SENTHIL, T

SHANKAR, R

机构：

[1] Department of Physics, Yale University, New Haven, CT 06520-8120

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.50.258

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Consider a d-dimensional antiferromagnet with a quantum disordered ground state and a gap to bosonic excitations with nonzero spin. In a finite external magnetic field, this antiferromagnet will undergo a phase transition to a ground state with nonzero magnetization, describable as the condensation of a dilute gas of bosons. The finite-temperature properties of the Bose gas in the vicinity of this transition are argued to obey a hypothesis of zero scale-factor universality for d < 2, with logarithmic violations in d = 2. Scaling properties of various experimental observables are computed in an expansion in epsilon = 2 - d, and exactly in d = 1.

引用

页码：258 / 272

页数：15

共 58 条

[21] NON-LINEAR FIELD-THEORY OF LARGE-SPIN HEISENBERG ANTI-FERROMAGNETS - SEMI-CLASSICALLY QUANTIZED SOLITONS OF THE ONE-DIMENSIONAL EASY-AXIS NEEL STATE [J].