Pressure dependence of Tc in Y-Ba-Cu-O superconductors

By considering the recent widely accepted dispersion of electronic structur e in cuprates, we analyze the pressure effect on the superconducting transi tion temperature T-c, in Y-Ba-Cu-O systems. Two intrinsic variables, i.e., the effective attractive interaction V-eff and the hole concentration on in the CuO2 plane, are proposed to be responsible for the pressure effect on T-c. Theoretical calculations agree well with experiments. Our results also suggested that the in-plane lattice parameter dependence of effective attr action V-eff obeys dlnV(eff)/dIna = -4 similar to -2 for Y-Ba-Cu-O systems.