Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 2: SC: Properties, Electronic Structure, Mechanisms 1
TT 2.9: Talk
Monday, March 14, 2011, 12:45–13:00, HSZ 301
Change of critical temperature by electric fields — •Klaus Morawetz1,2, Pavel Lipavský3, Jan Kolaček4, and Ernst Helmut Brandt5 — 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 — 5Max Planck Institute for Metals Research, D-70506 Stuttgart, Germany
Electrostatic charging changes the critical temperature of superconducting thin layers. To understand the basic mechanism, it is possible to use the Ginzburg-Landau theory with the boundary condition derived by de Gennes from the BCS theory. Here we show that a similar boundary condition can be obtained from the principle of minimum free energy. We compare the two boundary conditions and use the Budd-Vannimenus theorem as a test of approximations. Resulting consequences on measurable surface potentials and surface deformations are discussed and a new effect of discontinuity of the magnetocapacitance near Hc3 is presented.
[Phys. Rev. B 73 (2006) 052505-1-5, Phys. Rev. B 78 (2008) 174516-1-7, Phys. Rev. B 79 (2009) 174510-1-6, New J. Phys. 11 (2009) 023032-1-8]