Spin correlations in an isotropic spin-5/2 two-dimensional antiferromagnet

被引：19

作者：

Leheny, RL ^{[1
]}

Christianson, RJ

Birgeneau, RJ

Erwin, RW

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] NIST, Div Reactor Radiat, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.82.418

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a neutron scattering study of the spin correlations for the spin-5/2 two-dimensional antiferromagnet Rb(2M)nF(4) in an external magnetic field. Choosing fields near the system's bicritical point, we tune the effective anisotropy in the spin interaction to zero, constructing an ideal S = 5/2 Heisenberg system. The correlation length and structure factor amplitude are closely described by the semiclassical theory of Cuccoli et al. over a broad temperature range, but show no indication of approaching the low-temperature renormalized classical regime of the quantum nonlinear sigma model.

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页码：418 / 421

页数：4

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