2013/02/20 by S. P. Bayrakci, D. A. Tennant, Ph. Leininger +5 · 2 citations
Physics and Astronomy · #cond-mat.other #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.111.017204
5 pages, 4 figures
arxiv created 2013/02/20 · arxiv updated 2015/06/15
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.