Periodic Anderson model with electron-phonon correlated conduction band
  This paper reports dynamical mean field calculations for the periodic Anderson model in which the conduction band is coupled to phonons. Motivated in part by recent attention to the role of phonons in the $\gamma$-$\alpha$ transition in Ce, this model yields a rich and unexpected phase diagram which is of intrinsic interest. Specifically, above a critical value of the electron-phonon interaction, a first order transition with two coexisting phases develops in the temperature-hybridization plane, which terminates at a second order critical point. The coexisting phases display the familiar Kondo screened and local moment character, yet they also exhibit pronounced polaronic and bipolaronic properties, respectively. 
Peng Zhang, Peter Reis, Ka-Ming Tam, Mark Jarrell, Juana Moreno,   Fakher Assaad and Andy McMahan
cond-mat.str-el