Abstract
Major issues that limit the applicability of point-contact Andreev reflection (PCAR) spectroscopy for measurements of transport spin polarization $(P)$ are investigated. We show that the analysis of the PCAR spectra on the basis of the generalized Blonder-Tinkham-Klapwijk model may lead to degenerate solutions; i.e., the straightforward determination of $P$ from the multiparameter fitting is ambiguous. We have developed a refined method of analysis that reduces the ambiguity. This method is applied to several test cases (copper, NiMnSb, ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Si}$, ${\mathrm{Sr}}_{2}\mathrm{Fe}\mathrm{Mo}{\mathrm{O}}_{6}$), and it is found to work in materials with low and high $P$.
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