Mott Insulator to High Tc Superconductor via Pressure: Resonating Valence Bond Theory and Prediction of New Systems

G. Baskaran

doi:10.1103/PhysRevLett.90.197007

← Back to search

Mott Insulator to High Tc Superconductor via Pressure: Resonating Valence Bond Theory and Prediction of New Systems

G. Baskaran

DOI 10.1103/PhysRevLett.90.197007 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Mott insulator superconductor transition, via pressure and no external doping, is studied in orbitally nondegenerate spin-12 systems. It is presented as another resonating valence bond route to high Tc 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−2N0 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 Tc superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CaCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuS2O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuS4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CaCuS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(NH3)K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown