REENTRANT INSULATOR-METAL TRANSITION IN THE HALF-FILLED HUBBARD-MODEL

Using the d=infinity or local-approximation approach to the half-fille d Hubbard model on a compressible lattice, we present a detailed study of the transport and structural properties near the paramagnetic meta l-insulator transition. The results describe qualitatively most of the observed data in V2O3, including the metal-insulator-metal crossover [Kuwamoto et al., Phys. Rev. B 22, 2626 (1980)]. In addition, we discu ss an interesting and intrinsic reentrance feature in the resistivity of the half-filled Hubbard model at high temperatures.