Dynamical four-spin two-time correlation functions in a high-temperature Heisenberg paramagnet
- 1 February 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 15 (3), 1458-1464
- https://doi.org/10.1103/physrevb.15.1458
Abstract
We develop a general formalism for calculating four-spin two-time dynamical correlation functions in high-temperature paramagnets. The method used is similar to lowest-order diagrammatic approximations which have been successful in obtaining two-spin two-time dynamical correlation functions. In particular, the formalism is used on the Heisenberg paramagnet to obtain the energy-energy correlation function and related correlation functions measurable in Raman scattering or acoustic experiments.Keywords
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