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Spin Correlations in an Isotropic Spin-5/2 Two-Dimensional Antiferromagnet

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Title

Spin Correlations in an Isotropic Spin-5/2 Two-Dimensional Antiferromagnet

Author(s)

Leheny, R. L.
Christianson, Rebecca J.
Birgeneau, R. J.

Description

We report a neutron scattering study of the spin correlations for the spin-5/2 two-dimensional antiferromagnet Rb2MnF4 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.

Date Published

2018-03-26

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  • Download SpinCorrelations_Christianson.pdf

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