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

R. L. Leheny; R. J. Christianson; R. J. Birgeneau; R. W. Erwin

doi:10.1103/PhysRevLett.82.418

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

Strongly Correlated Electrons 2009-10-31 v1

Authors: R. L. Leheny , R. J. Christianson , R. J. Birgeneau , R. W. Erwin

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Abstract

We report a neutron scattering study of the spin correlations for the spin 5/2, two-dimensional antiferromagnet Rb_2MnF_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 non-linear sigma model.

Keywords

heisenberg spin chains spin excitations in condensed matter magnetism

Cite

@article{arxiv.cond-mat/9809178,
  title  = {Spin correlations in an isotropic spin-5/2 two-dimensional antiferromagnet},
  author = {R. L. Leheny and R. J. Christianson and R. J. Birgeneau and R. W. Erwin},
  journal= {arXiv preprint arXiv:cond-mat/9809178},
  year   = {2009}
}

Comments

4 pages, 3 EPS figures

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