Critical spin liquid phase in the presence of Kondo frustration

The heavy fermion phase is expected to be robust in the periodic Anderson lattice systems when the density of states of conduction electrons at the Fermi energy is finite. In such systems the spin liquid phase driven by geometrical frustration usually coexist with Kondo screening. Here we study a periodic Anderson-Heisenberg triangular lattice model with both geometric and Kondo frustrations, the latter being caused by the on-site and the nearest neighbor site c -f hybridizations. We show the existence of the Kondo breakdown quantum phase transition at a critical hybridization strength Vc below which the dynamically-decoupled local moment spin liquid phase emerges. Such phase is closely linked to the nodal points of the hybridization function in the presence of Kondo frustration.