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Название: A green function approach to the paramagnetic phase of a Heisenberg ferromagnet
Авторы: R. H. Knapp, D. ter Haar
Аннотация:
A higher-order decoupling similar to the first-order Bogolyubov-Tyablikov decoupling is used to find various correlation functions in the paramagnetic region for a Heisenberg ferromagnet. Expressions are given for the susceptibility, the nearest-neighbor correlation, and autocorrelation at the critical point as well as at high temperatures.