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TT: Fachverband Tiefe Temperaturen
TT 9: SC: Poster Session
TT 9.42: Poster
Montag, 22. März 2010, 14:00–18:00, Poster A
Surface superconductivity controlled by electric field — •Klaus Morawetz1,2, Pavel Lipavský3,4, and Jan Kolaček4 — 1University of Applied Science Münster, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — 2International Center for Condensed Matter Physics, Universidade de Brasília, 70904-910, Brasília-DF, Brazil — 3Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 12116 Prague 2, Czech Republic — 4Institute of Physics, Academy of Sciences, Cukrovarnická 10, 16253 Prague 6, Czech Republic
We discuss an effect of the electrostatic field on superconductivity near the surface. First, we use the microscopic theory of de Gennes to show that the electric field changes the boundary condition for the Ginzburg-Landau function. Second, the effect of the electric field is evaluated in the vicinity of Hc3, where the boundary condition plays a crucial role.We predict that the field effect on the surface superconductivity leads to a discontinuity of the magnetocapacitance. We estimate that the predicted discontinuity is accessible for nowadays experimental tools and materials. It is shown that the magnitude of this discontinuity can be used to predict the dependence of the critical temperature on the charge carrier density which can be tailored by doping.