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A self-consistent correlation theory is developed which is a systematic generalization of the random-phase approximation and with an equally wide range of applicability. For simplicity the theory is here given in detail for one dynamical variable. For a test of the theory static and dynamic magnetic properties for EuO and EuS for T≥Tc are calculated. Quantitative agreement with the comprehensive and detailed experimental data is obtained for T≥1.02Tc with no adjustable parameters. A dependence on the lattice and spin dimension as well as the value of the spin is obtained and is in agreement with high-temperature-expansion results.
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Per-Anker Lindgård (1983) studied this question.
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