Effect of Magnon-Magnon Interaction on Spin Wave Dispersion and Magnon Sideband in MnS

摘要: The temperature-dependent magnon energies and sidebands in MnS have been studied theoretically by the spin wave approximation including magnon-magnon interaction neglecting exciton-magnon interaction. Results found are: (1) temperature renormalization factor for depends strongly on wavevector is different from that sublattice magnetization; (2) line shape insensitive to temperature, peak position, which corresponds energy at k =1.2π[1, 1, 0]/ a , shifts slowly with temperature; (3) integrated intensity of cold band almost constant low temperatures but decreases slightly increasing contrast rapid increase predicted free theory. For hot band, increases more than total gradually temperature. magnetization, as function...