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Regular version of the site

Article

Equilibrium dynamics of a paramagnet cluster

Physical Review B: Condensed Matter and Materials Physics. 1995. Vol. 51. No. 6. P. 3974-3977.
Kolokolov I., Chertkov M.

The transverse autocorrelation function at an arbitrary temperature is calculated rigorously for a system with an arbitrary number of quantum spins, each of which is coupled to all the other spins with equal exchange. It is shown that the cluster approximation, formed by a model for a real magnet, explains short- and intermediate-time (up to the time to reach the spin-diffusion regime) experimental measurements in the paramagnetic phase.