Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.41: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Discontinuity of capacitance at the onset of surface superconductivity controlled by electric fields — •Klaus Morawetz1,2, Pavel Lipavský3,4, and Jan Kolaček4 — 1University of Applied Science Münster, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — 2International Institute of Physics (IIP), Universidade Federal do Rio grande do Norte - UFRN, 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
The effect of the electrostatic field is discussed on superconductivity near the surface exposed to magnetic fields. The Ginzburg-Landau equation is solved near the surface and the surface energy is calculated. The nucleation critical field is shown to be changed in dependence on the magnetic and electric field. The surface energy becomes strongly dependent on the width of the sample. 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.
[Phys. Rev. B 78 (2008) 054525; New J. Phys. 11 (2009) 023032-1-8; Lecture notes in Physics 733, Springer Verlag Berlin (2007); Springer Series NanoScience and Technology, Springer (2010)]