Unified theory of dynamical mean field and self-consistently renormalized spin-fluctuations

Abstract

A unified theory of the dynamical mean-field and the self-consistently renormalized spin-fluctuations (SCR) for strongly correlated electron systems is proposed. Starting from the iterative perturbation theory, local dynamical magnetic susceptibility χ L( ω) is constructed with inclusion of the vertex corrections, and the effect of spin fluctuations is incorporated in the form similar to the SCR theory. Temperature dependence of specific heat and electrical resistivity are calculated to be proportional to T(1− const. T ) and T 3/2, respectively, at the quantum critical point and low temperatures.