Spin-dependent Transparency of Ferromagnet/Superconductor Interfaces

Details Spin-dependent Transparency of Ferromagnet/Superconductor Interfaces Spin-dependent Transparency of Ferromagnet/Superconductor Interfaces

2002-02-27

arxiv.org/abs/cond-mat/0202515v1

Physics

Condensed Matter

Materials Science

4 pages, 1figure. submitted

Scientific paper

10.1103/PhysRevLett.89.166603

Because the physical interpretation of the spin-polarization of a ferromagnet determined by point-contact Andreev reflection (PCAR) is non-trivial, we have carried out parameter-free calculations of PCAR spectra based upon a scattering-theory formulation of Andreev reflection generalized to spin-polarized systems and a tight-binding linear muffin tin orbital method for calculating the corresponding scattering matrices. PCAR is found to measure the spin-dependent interface transparency rather than the bulk polarization of the ferromagnet which is strongly overestimated by free electron model fitting.

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