2-MAGNON RAMAN-SCATTERING IN A SPIN-DENSITY-WAVE ANTIFERROMAGNET

We present the results for a model calculation of resonant two-magnon Raman scattering in a spin density wave (SDW) antiferromagnet. The res onant enhancement of the two-magnon intensity is obtained from a micro scopic analysis of the photon-magnon coupling vertex. By combining mag non-magnon interactions with 'triple resonance' phenomena in the verte x function the resulting intensity line shape is found to closely rese mble the measured two-magnon Raman signal in antiferromagnetic cuprate s. Both, resonant and non-resonant Raman scattering are discussed for the SDW antiferromagnet and a comparison is made to the conventional L oudon-Fleury theory of two-magnon light scattering.