Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-09-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 2 figures, submitted to Proceedings of the 26th Conference on Low Temperature Physics
Scientific paper
Point-contact Andreev reflection spectroscopy is used to measure the spin polarization of metals but analysis of the spectra has encountered a number of serious challenges, one of which is the difficulty to distinguish the effects of spin polarization from those of the finite lifetime of Cooper pairs. We have recently confirmed the polarization-lifetime ambiguity for Nb-Co and Nb-Cu contacts and suggested to use Fermi surface mismatch, the normal reflection due to the difference of Fermi wave vectors of the two electrodes, to solve this dilemma. Here we present further experiments on contacts between superconducting Nb and the ferromagnets Fe and Ni as well as the noble metals Ag and Pt that support our previous results. Our data indicate that the Nb - normal metal interfaces have a transparency of up to about 80 per cent and a small, if not negligible, spin polarization.
Gloos Kurt
Tuuli Elina
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