Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique
TT 32.12: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Surface superconductivity and capacitance of superconductors under electric and magnetic fields — •Klaus Morawetz1,2, Pavel Lipavsky3,4, Jan Kolacek4, Ernst Helmut Brandt5, and Michael Schreiber1 — 1Forschungszentrum Dresden-Rossendorf, PF 51 01 19, 01314 Dresden, Germany — 2International Center for Condensed Matter Physics, 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 — 5Max Planck Institute for Metals Research, D-70506 Stuttgart, Germany
A superconducting layer exposed to a perpendicular electric and parallel magnetic field is considered within the Ginzburg-Landau (GL) approach. The GL equation is solved near the surface and the surface energy is calculated [1,2]. The nucleation critical field is shown to be changed in dependence on the magnetic and electric field. Special consideration is payed to the induced magnetic-field effect caused by diamagnetic surface currents. The latter effect constitutes the main contribution to the effective inverse capacitance which determines the effective penetration depth. The surface energy becomes strongly dependent on the width of the sample. An experimental realization is suggested for determining the change in the effective capacitance of the layer.
[1] Phys. Rev. B 78 (2008)054525
[2] arXiv 0804.0138