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Although diagrammatic perturbation theory fails for the dynamical-mean fieldtheory of the double-exchange model, the theory is nevertheless Phi-derivableand hence thermodynamically consistent, meaning that the same thermodynamicproperties are obtained from either the partition function or the Green'sfunction. We verify this consistency by evaluating the magnetic susceptibilityand Curie temperature for any Hund's coupling.Comment: 9 pages, 1 figur

Thermodynamic consistency of the dynamical mean-field theory of the double-exchange model