Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 23: Posters Superconductivity, Solids at Low Temperature
TT 23.41: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU D
Surface potential in 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 close to the surface of superconductors in the Meissner state is discussed. We show that beside the Bernoulli potential, the quasiparticle screening, and the thermodynamic contribution due to Rickayzen, there is a non-local contribution which is large for both type-I and weak type-II superconductors [1]. A generalization of the Budd-Vannimenus theorem is found which allows one to evaluate the observed potential without the explicit solution of the charge profile at the surface [2]. The electrostatic potential above the Abrikosov vortex lattice is evaluated numerically. We propose an experimental measurement by NMR [3] to access this field which can yield informations about material parameters.
[1] P. Lipavský, K. Morawetz, J. Koláček, J. J. Mareš, E. H. Brandt, M. Schreiber, Phys. Rev. B 69 (2004) 024524-1-7
[2] P. Lipavský, K. Morawetz, J. Koláček, J. J. Mareš, E. H. Brandt, M. Schreiber, Phys. Rev. B 70 (2004) 104518-1-7
[3] P. Lipavský, J. Kolacek, K. Morawetz, E. H. Brandt, Phys. Rev. B 66 (2002) 134525