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The low-temperature magnetic excitations of the two-dimensional spin-$\frac{5}{2}$ square-lattice Heisenberg antiferromagnet ${\mathrm{Rb}}_{2}\mathrm{Mn}{\mathrm{F}}_{4}$ 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.

physical review. b, condensed matter and materials physics

Two-magnon excitations observed by neutron scattering in the two-dimensional spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mstyle scriptlevel="1"><mml:mfrac bevelled="false"><mml:mn>5</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mstyle></mml:math>Heisenberg antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Rb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="…

Two-magnon excitations observed by neutron scattering in the two-dimensional spin-52Heisenberg antiferromagnetRb2