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TT: Tiefe Temperaturen
TT 15: Superconductivity - Properties, Electronic Structure, Order Parameter I
TT 15.2: Talk
Saturday, March 5, 2005, 14:15–14:30, TU H2053
Electric fields above the surface of superconductors — •K. Morawetz2,3, P. Lipavský1, Jan Koláček1, J.J. Mares1, E.H. Brandt4, and M. Schreiber2 — 1Institute of Physics, Academy of Sciences, Cukrovarnická 10, 16258 Praha 6, Czech Republic — 2Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — 3Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany — 4Max-Planck-Institute for Metal Research, D-70506 Stuttgart, Germany
The electrostatic potential above the Abrikosov vortex lattice, discussed earlier by Blatter et al. [Phys. Rev. Lett. 77, 566 (1996)], is evaluated within the Ginzburg-Landau theory [1]. Unlike previous studies we include the surface dipole [2,3]. Close to the critical temperature, the surface dipole reduces the electrostatic potential to values below sensitivity of recent sensors. At low temperatures the surface dipole is less effective and the electrostatic potential remains observable as predicted earlier. Within the extension of the Landau-Ginzburg theory towards lower temperatures the electric fields above the superconducting surface are calculated for different experimental situations.
[1] P. Lipavský, K. Morawetz, J. Kolacek, J. J. Mares, E. H. Brandt, M. Schreiber, Pys. Rev. B in press, cond-mat/0409397
[2] P. Lipavský, K. Morawetz, J. Koláček, J. J. Mareš, E. H. Brandt, M. Schreiber, Phys. Rev. B 69 (2004) 024524-1-7
[3] P. Lipavský, K. Morawetz, J. Koláček, J. J. Mareš, E. H. Brandt, M. Schreiber, Phys. Rev. B 70 (2004) 104518-1-7