Mott insulator to high Tc superconductor via pressure:: Resonating valence bond theory and prediction of new systems -: art. no. 197007

Mott insulator superconductor transition, via pressure and no external doping, is studied in orbitally nondegenerate spin-1/2 systems. It is presented as another resonating valence bond route to high T-c superconductivity. We propose a "strong coupling" hypothesis that views long range Coulomb force driven first order Mott transition as a self-doping process that also preserves superexchange on the metal side. We present a two-species t-J model where conserved N-0 doubly occupied (e(-)) sites and N-0 empty sites (e(+)) hop in the background of N -2N(0) singly occupied (neutral) sites in a lattice of N sites. An equivalence to the regular t-J model is made. Some old and new systems are predicted to be candidates for pressure-induced high T-c superconductivity.