Dresden 2009 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Non-Cuprate Non-Ferropnictide Superconductors
TT 14.9: Talk
Tuesday, March 24, 2009, 12:00–12:15, HSZ 105
Discontinuity of capacitance at the onset of surface superconductivity — •Klaus Morawetz1,2, Pavel Lipavsky3,4, and Jiri Mares4 — 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
The effect of the magnetic field on a capacitor with a superconducting electrode is studied within the Ginzburg-Landau approach. It is shown that the capacitance has a discontinuity at the onset of the surface superconductivity which is expressed as a discontinuity in the penetration depth of the electric field into metals. This new effect establishes a macroscopic signal of the onset of superconducting correlations. This discontinuity is observable with recent bridges for both conventional and high-Tc superconductors.
Phys. Rev. B 78 (2008) 054525-1-13