ELECTRIC-FIELD EFFECTS AT THE SURFACE OF HIGH-TEMPERATURE SUPERCONDUCTORS

The results of experiments on the influence of electrostatic field (EF ) on the electrophysical parameters of high-T-c superconductors are pr esented. It was shown that action of the negative EF leads to an incre ase of critical temperature for about 6K in ceramic and about 0.6 K in thin film samples. The action of EF on the fluctuation excess conduct ivity in YBaCuO thin film nas studied. It was shown that EF decreases the amplitude of thermodynamic fluctuations of the order parameter in the domain of 3D fluctuations. The negative EF applied to the film sur face has been found to increase the activation energy of flux creep in relatively low magnetic fields. The upper critical magnetic field inc reases in the vicinity of T-c under the influence of the EF.