A Green Function Approach to Two-Magnon Light Scattering in Antiferromagnets at T < TN
In this paper we describe some calculations for the temperature dependence of two-magnon light scattering in antiferromagnets. This involves using a Green function diagrammatic perturbation expansion to generalise the zero temperature results of Elliott and Thorpe1 to T ≠ O. The theory and results are described here only in outline, whilst details are given in refs.2,3 and 4. Other calculations for two-magnon light scattering at T ≠ O have recently been reviewed by Balucani and Tognetti5. In section 2 we describe the Green function perturbation formalism and its application to evaluating the two-magnon scattering cross-section. In section 3 the theory is applied to several antiferromagnets for T < TN and comparison is made with experimental data.
KeywordsGreen Function Rutile Structure Molecular Field Approximation Molecular Field Theory Quasiparticle Interaction
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- 9.See for example D. Pines and P. Nozieres, “The Theory of Quantum Liquids, 1” (Benjamin, New York, 1966), section 5.5Google Scholar