Two-magnon excitations observed by neutron scattering in the two-dimensional spin-52 Heisenberg antiferromagnet Rb2MnF4

T. Huberman, R. Coldea, R. A. Cowley, D. A. Tennant, R. L. Leheny, R. J. Christianson, and C. D. Frost
Phys. Rev. B 72, 014413 – Published 6 July 2005

Abstract

The low-temperature magnetic excitations of the two-dimensional spin-52 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.

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  • Received 2 March 2005

DOI:https://doi.org/10.1103/PhysRevB.72.014413

©2005 American Physical Society

Authors & Affiliations

T. Huberman, R. Coldea, and R. A. Cowley

  • Oxford Physics, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

D. A. Tennant

  • School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, FIFE KY16 9SS, Scotland, United Kingdom

R. L. Leheny

  • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA

R. J. Christianson

  • Department of Physics & DEAS, Harvard University, Cambridge, Massachusetts 02138, USA

C. D. Frost

  • Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

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Issue

Vol. 72, Iss. 1 — 1 July 2005

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