KONDO INSULATOR - P-WAVE BOSE CONDENSATE OF EXCITONS

In the Anderson lattice model for a mixed-valent system, the d-f hybri dization can possess a p-wave symmetry. The strongly correlated insula ting phase in the mean-field approximation is shown to be a p-wave Bos e condensate of excitons with a spontaneous lattice deformation. We st udy the equilibrium and linear response properties across the insulato r-metal transition. Our theory supports the empirical correlation betw een the :lattice deformation and the magnetic susceptibility and predi cts measurable ultrasonic and high-frequency phonon behavior in mixed- valent semiconductors.