Two-Impurity Dynamical-Mean-Field-Theory Study of the Periodic Anderson Model

We solve the periodic Anderson model using a two impurity dynamical mean field theory via QMC. We obtain the temperature v.s. hybridization phase diagram. In the crossover region, we observe logarithmic temperature ($T$) dependence in energy. As the quantum critical point (QCP) is approached, both the Neel and the lattice Kondo temperatures decrease and the two lines do not tend to cross at a finite temperature. We observe strong ferromagnetic spin fluctuations near the QCP on the Kondo side. Our results indicate that the critical spin susceptibility is local in space at the QCP.