Electric field effects in YBa₂Cu₃O_7-δ films

A brief summary of the electric field effects on the normal and the superconducting state of high-Tc superconductors is given. Experiments are presented in which electric fields were used to modulate the transport properties of weakly linked YBa2Cu3O7-δ films. It is found that the critical temperature Tc0 of such films can be reduced by ≈10 K by applying electric fields of ≈6 MV/cm. In one case, Tc0 shifts of up to 25-30 K were observed. These are by far the largest Tc shifts reported for any superconducting system. © 1994.