Session W28 - High T$_c$ Superconductors XXII: Mesoscopic Superconductivity and Josephson Coupling.
ORAL session, Thursday morning, March 15
Room 616, Washington State Convention Center

[W28.008] A Simple Model for Charge Transport in Ferromagnet/Superconductor Point Contacts

Paul J. Dolan Jr., Charles W. Smith (Dept. of Physics and Astronomy, University of Maine, Orono, Maine 04469-5709)

The BTK model (G.E. Blonder, M. Tinkham, T.M. Klapwijk, Phys. Rev. B25 (1982) 4515.) for normal metal/superconductor point contacts is modified to include electron spin polarization. This leads to a reduction in the availability of electrons from the minority spin band for Cooper pair formation and results in a decrease in the probability of Andreev reflection. This model exhibits all the major effects of a more rigorous model (A.A. Golubov, Physica C 326-327 (1999) 46.) but with the added feature that the spin polarization parameter can be uniquely extracted from charge transport data. Comparison with measurements will be presented.

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