Two-magnon excitations observed by neutron scattering in the two-dimensional spin-5/2 Heisenberg antiferromagnet Rb2MnF4

Abstract

The low-temperature magnetic excitations of the two-dimensional spin-5/2 square-lattice Heisenberg antiferromagnet Rb2MnF4 have been probed using pulsed inelastic neutron scattering. In addition to dominant sharp peaks identified with one-magnon excitations, a relatively weak continuum scattering is also observed at higher energies. This is attributed to neutron scattering by pairs of magnons and the observed intensities are consistent with predictions of spin wave theory.

arXiv comment10 pages, 11 figures, accepted for publication in Physical Review B

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• Does the Heisenberg model describe the multimagnon spin dynamics in antiferromagnetic CuO layers ?
• Spin-wave excitation spectra and spectral weights in square lattice antiferromagnets
• Spin correlations in an isotropic spin-5/2 two-dimensional antiferromagnet

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