Abstract
An exact diagram technique suitable especially for calculating the time dependent correlation functions in the Heisenberg model is given. We apply it to investigate the equal-time and the dynamic spin-spin correlations of this model in the paramagnetic region and at the critical point. AtT c numerical results are given.
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Based on the author's doctoral dissertation „Zum Heisenberg-Modell im paramagnetischen Bereich und am kritischen Punkt“, Technische Hochschule München, Mai 1968.
I wish to thank Prof. W.Brenig, Dr. W.Götze and Dr. E.Riedel for helpful discussions.
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Wegner, F. On the Heisenberg model in the paramagnetic region and at the critical point. Z. Physik 216, 433–455 (1968). https://doi.org/10.1007/BF01390873
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DOI: https://doi.org/10.1007/BF01390873