Two-magnon Raman scattering in a spin density wave antiferromagnet
arXiv:cond-mat/9605056 · doi:10.1016/S0921-4526(96)00828-9
Abstract
We present the results for a model calculation of resonant two-magnon Raman scattering in a spin density wave (SDW) antiferromagnet. The resonant enhancement of the two-magnon intensity is obtained from a microscopic analysis of the photon-magnon coupling vertex. By combining magnon-magnon interactions with `triple resonance` phenomena in the vertex function the resulting intensity line shape is found to closely resemble the measured two-magnon Raman signal in antiferromagnetic cuprates. Both, resonant and non-resonant Raman scattering are discussed for the SDW antiferromagnet and a comparison is made to the conventional Loudon-Fleury theory of two-magnon light scattering.
32 pages, gz-compressed uuencoded tar- Latex-file with 8 embedded figures