Lifetimes of antiferromagnetic magnons in two and three dimensions: experiment, theory, and numerics

Abstract

A high-resolution neutron spectroscopic technique is used to measure momentum-resolved magnon lifetimes in the prototypical two- and three-dimensional antiferromagnets Rb2MnF4 and MnF2, over the full Brillouin zone and a wide range of temperatures. We rederived theories of the lifetime resulting from magnon-magnon scattering, thereby broadening their applicability beyond asymptotically small regions of wavevector and temperature. Corresponding computations, combined with a small contribution reflecting collisions with domain boundaries, yield excellent quantitative agreement with the data.

5 pages, 4 figures

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• Spontaneous Magnon Decays
• Magnon Decay in Noncollinear Quantum Antiferromagnets
• Spin-Wave Lifetimes Throughout the Brillouin Zone
• Mesoscopic Phase Coherence in a Quantum Spin Fluid
• A study of the quantum classical crossover in the spin dynamics of the 2D S=5/2 antiferromagnet Rb2MnF4: neutron scattering, computer simulations, and analytic theories
• Lifetime of Gapped Excitations in a Collinear Quantum Antiferromagnet
• Highly Dispersive Scattering From Defects In Non-Collinear Magnets
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