Understanding the heavy fermion phenomenology from a microscopic model.
We solve the 3D periodic Anderson model using a two impurity cluster dynamical mean field theory. We obtain the temperature versus hybridization phase diagram. Approaching the quantum critical point (QCP) both the Néel and lattice Kondo temperatures decrease and they do not cross at the lowest temperature we reached. While strong ferromagnetic spin fluctuation on the Kondo side is observed, our result suggests the critical static spin susceptibility is local in space at the QCP. We observe in the crossover region a logarithmic temperature dependence in the specific heat coefficient and spin susceptibility.
Sun
Ping
P
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA.
Kotliar
Gabriel
G