Lifetimes of antiferromagnetic magnons in two and three dimensions: experiment, theory, and numerics
classification
❄️ cond-mat.str-el
cond-mat.other
keywords
lifetimessmallagreementantiferromagneticantiferromagnetsapplicabilityasymptoticallybeyond
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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.
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