J. Phys. IV France 08 (1998) Pr3-305-Pr3-308
Electric field effects at the surface of high-temperature superconductorsV.S. Lysenko1, I.P. Tyagulski1, V.Z. Lozovski1, Y.V. Gomeniuk1, I.N. Osiyuk1 and V.N. Variukhin2
1 Institute of Semiconductor Physics, NAS of Ukraine, 45 Prospekt Nauki, 252650 Kiev, Ukraine
2 Donetsk Physico-Technical Institute, NAS of Ukraine, 72 ul.R.Luxemburg, 340114 Donetsk, Ukraine
The results of experiments on the influence of electrostatic field (EF) on the electrophysical parameters of high-TC superconductors are presented. It was shown that action of the negative EF leads to an increase of critical temperature for about 6K in ceramic and about 0.6 K in thin film sarnples. The action of EF on the fluctuation excess conductivity in YBaCuO thin film was 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 surface has been found to increase the activation energy of flux creep in relatively low magnetic fields. The upper critical magnetic field increases in the vicinity of Tc under the influence of the EF.
© EDP Sciences 1998