Magnetic susceptibility and order parameter of the spin-glass-like phase of the double-exchange model

The magnetic susceptibility and Edwards-Anderson order parameter q of the spin-glass-like (SGL) phase of the double-exchange model are evaluated in the weak-coupling or RKKY limit. Dynamical mean-field theory is used to show that q=M(T/TSGL)2, where M is the classical Brillouin function and TSGL is the SGL transition temperature. The correlation length of the SGL phase is determined by a correlation parameter Q that maximizes TSGL and minimizes the free energy. The magnetic susceptibility has a cusp at TSGL and reaches a nonzero value as T→0.