Pressure dependence of T-c for La2-xSrxCuO4 as a function of carrier concentration

The pressure effect on T-c for La2-xSrxCuO4 has been investigated within th e van Hove singularity scenario of high-T-c superconductivity by taking int o account the variation of the Fermi energy and the effective attractive in teraction with pressure. It was found that the pressure coefficient of T-c decreases with increasing T-c and remains positive over the whole doping re gion. The predicted T-c increases with increasing pressure, reaching a maxi mum at 4 GPa, and then decreases with further increasing pressure. These re sults are in agreement with experiments.