2016/06/30 by A. L. Chernyshev, P. A. Maksimov · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.117.187203
published as Phys. Rev. Lett. 117, 187203 (2016) · 4.5 p + 4 figs main, 8 p + 16 figs supplemental, typos corrected
arxiv created 2016/10/20 · arxiv updated 2016/10/28
We demonstrate that interactions can substantially undermine the free-particle description of magnons in ferromagnets on geometrically frustrated lattices. The anharmonic coupling, facilitated by the Dzyaloshinskii-Moriya interaction, and a highly-degenerate two-magnon continuum yield a strong, non-perturbative damping of the high-energy magnon modes. We provide a detailed account of the effect for the S=1/2 ferromagnet on the kagomé lattice and propose further experiments.