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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 T_c. 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