The variation of the transition temperature of high T-c superconductors byelectric field effect

High Te superconductor is considered as an alternately stacked metal and in sulating layers. The electric field effect in this layer superconductor is investigated by the Thomas-Fermi(TF) approximation for the screening of an applied electric field and in the frame of Ginzburg-Landau(CL) theory with the coupling between metallic layers for the transition temperature. The ch ange of the transition temperature related to the coupling constant and app lied voltage is derived for two and three CuO2 layers. The transition tempe rature for more than three layers is also briefly discussed.