Pressure dependence of T(c) in Y-Ba-Cu-O superconductors

By considering the recent widely accepted dispersion of electronic structure in cuprates, we analyze the pressure effect on the superconducting transition temperature T(c) in Y-Ba-Cu-O systems. Two intrinsic variables, i.e., the effective attractive interaction V(eff) and the hole concentration n(H) 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 attraction V(eff) obeys dlnV(eff)/dlna = -4 approximately -2 for Y-Ba-Cu-O systems.