Green's function approach to the treatment of spin pair Raman scattering in the paramagnetic region

The paramagnetic region of Heisenberg antiferromagnets has been investigated by means of a Green's function technique, with a second-order decoupling procedure appropriate to the disordered phase. The relevance of this method to the interpretation of spin-pair Raman scattering experiments in this phase is pointed out; in particular, a fair agreement is obtained with measured Raman peak frequencies in the paramagnetic phase of RbMnF₃.