Thermodynamic Consistency of the Dynamical Mean-Field Theory of the Double-Exchange Model

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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9 pages, 1 figure

Scientific paper

10.1103/PhysRevB.71.180405

Although diagrammatic perturbation theory fails for the dynamical-mean field theory of the double-exchange model, the theory is nevertheless Phi-derivable and hence thermodynamically consistent, meaning that the same thermodynamic properties are obtained from either the partition function or the Green's function. We verify this consistency by evaluating the magnetic susceptibility and Curie temperature for any Hund's coupling.

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