Method of effective potential for quantum Heisenberg ferromagnet theory
E. V. Podivilov
Abstract
Self - consistent temperature dependence of the average magnetization in quantum Heisenberg ferromagnet is obtained as a first approximation of perturbation theory on an inverse radius by application of the functional method for quantum ferromagnet. The experimental data are compared with the theoretical results for EuO ferromagnet. A quantitative agreement is observed between theoretical and experimental results outside interval near Curie temperature. The theory is of critical behavior in the vicinity of Curie temperature Tc. Theoretical Tc value itself is agreed with the experimental one with an accuracy of several percents.
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