Abstract
We consider a model of Raman scattering for a two-dimensional S=1/2 Heisenberg antiferromagnet which includes a dynamical spin-phonon interaction. We observe a broadening of the line shape due to increased coupling with excited high-energy spin states. Our results are close to a model of random, static exchange interactions, introduced in this context by Haas et al. [J. Appl. Phys. 75, 6340 (1994)], which, when extended to large numbers of spins, explains experiments in the parent insulating compounds of high-${\mathit{T}}_{\mathit{c}}$ superconduc- tors. \textcopyright{} 1996 The American Physical Society.
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