Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 20: Postersitzung IV (Mesoskopische Systeme, Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen)
TT 20.51: Poster
Donnerstag, 27. März 2003, 14:30–19:00, P2c, P2d
Bernoulli potential at a superconductor surface — •Klaus Morawetz2, Pavel Lipavský1, Jan Koláček1, and Ernst Helmut Brandt3 — 1Institute of Physics, Academy of Sciences, Cukrovarnická 10, 16258 Praha 6, Czech Republic — 2Max-Planck-Institute for the Physics of Complex Systems, Noethnitzer Str. 38, 01187 Dresden, Germany — 3Max-Planck-Institut für Metallforschung, D-70506 Stuttgart, Germany
The electrostatic Bernoulli potential measured at the surface of a superconductor via Kelvin capacitive coupling is shown to be independent of the pairing mechanism. This contrasts with the Bernoulli potential in the bulk where contributions due to pairing dominate close to Tc. In order to find this, the Budd-Vannimenus theorem is modified to the surface of superconductors in the Meissner state. This identity links the surface value of the electrostatic potential to the free energy in the bulk which allows one to evaluate the observed potential without the explicit solution of the charge profile at the surface.
[1] P. Lipavský, J. Koláček, J. J. Mareš and K. Morawetz, Phys. Rev. B 65, 012507 (2002), P. Lipavský, K. Morawetz, J. Koláček, J. J. Mareš and E.H. Brandt, cond-mat/0212152