G. Baskaran et al., THE RESONATING VALENCE-BOND STATE AND HIGH-T(C) SUPERCONDUCTIVITY - AMEAN-FIELD THEORY (REPRINTED FROM SOLID-STATE COMMUN, VOL 63, PG 973-976, 1987), Solid state communications, 88(11-12), 1993, pp. 853-856
A mean field type theory is developed for the insulating RVB state and
high temperature superconductivity in doped La2CuO4 and other high-T(
c) oxides. The T(c) as a function of the doping parameter delta drops
sharply around t/U is similar to delta. The zero temperature gap versu
s T(c) relation depends sensitively on the choice of the parameters. G
utzwiller projection, suppression of T(c) by phase fluctuations for sm
all delta and screening effects are briefly discussed.