A green function approach to the paramagnetic phase of a Heisenberg ferromagnet |
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| Authors: | R. H. Knapp Jr. D. ter Haar |
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| Affiliation: | (1) Department of Theoretical Physics, Oxford University, Oxford, England;(2) Present address: Department of Physics, Carnegie-Mellon University, Pittsburgh, Pennsylvania, USA |
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| Abstract: | 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.This paper is based on the first author's Oxford University D. Phil, thesis. A preliminary account has been published elsewhere. (1) |
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| Keywords: | Paramagnetic phase of Heisenberg ferromagnet Green function methods |
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