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Phys. Rev. B 51, 3974–3977 (1995)

Equilibrium dynamics of a paramagnetic cluster

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Michael Chertkov
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel

Igor Kolokolov
Budker Institute for Nuclear Physics, Novosibirsk 630 090, Russia
INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy

Received 21 November 1994; published in the issue dated 1 February 1995

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.

© 1995 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.51.3974
DOI:
10.1103/PhysRevB.51.3974
PACS:
75.10.Jm, 02.30.Cj
 
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