Mott Insulator to high \tc Superconductor via Pressure: Resonating Valence Bond theory and prediction of new Systems

Details Mott Insulator to high \tc Superconductor via Pressure: Resonating Valence Bond theory and prediction of new Systems Mott Insulator to high \tc Superconductor via Pressure: Resonating Valence Bond theory and prediction of new Systems

2002-11-06

arxiv.org/abs/cond-mat/0211107v1

Physical Review Letters, 90, 197007 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages of LaTex file, 3 figures in eps files

Scientific paper

10.1103/PhysRevLett.90.197007

Mott insulator superconductor transition, via pressure and no external doping, is studied in orbitally non degenerate spin-\half systems. It is presented as another RVB route to high \tc superconductivity. We propose a `strong coupling' hypothesis which helps to view first order Mott transition as a self doping process that also preserves superexchange on metal side . We present a generalized t-J model where a conserved $N_0$ doubly occupied ($e^-$) sites and $N_0$ empty sites ($e^+$) hop in the background of $N - 2 N_0$ singly singly occupied (neutral) sites in a lattice of N sites. An equivalence to the regular t-J model is made and some old and new systems are predicted to be candidates for pressure induced high \tc superconductivity.

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