Mott insulator to high Tc superconductor via pressure: resonating valence bond theory and prediction of new systems |
| |
Authors: | Baskaran G |
| |
Institution: | Institute of Mathematical Sciences, C.I.T. Campus, Madras 600 113, India. |
| |
Abstract: | 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 N0 doubly occupied (e(-)) sites and N0 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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|