Variational Theory of the Heisenberg Ferromagnet

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Abstract
Under the assumption of the existence of model Hamiltonian, the variational theory which is proposed by Sawada is applied to the Heisenberg Ferromagnet. The spontaneous magnetization at one and two dimensions does not exist, and the Curie temperature at three dimensions agrees with that of molecular field theory. In low temperature regions the temperature dependence of spin wave energy agrees with that of Bloch's calculations.

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