Paramagnetic-ferromagnetic transition in a double-exchange model
Abstract
We study paramagnetic - ferromagnetic transition due to exchange interaction between classical localized magnetic moments and conduction electrons. We formulate the Dynamical Mean Field Approximation equations for arbitrary electron dispersion law, concentration and relation between exchange coupling and the electron band width. Solving these equations we find explicit formula for the transition temperature Tc. We present the results of calculations of the Tc for the semi-circular electron density of states.
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