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We report measurements of the spin polarization (\textbf{\textit{P}}) of theconcentrated magnetic semiconductor EuS using both zero-field and Zeeman-splitAndreev reflection spectroscopy (ARS) with EuS/Al planar junctions. Thezero-field ARS spectra are well described by the modified (spin-polarized) BTKmodel with expected superconducting energy gap and actual measurementtemperature (no additional spectral broadening). The fittings consistentlyyield \textbf{\textit{P}} close to 80% regardless of the barrier strength.Moreover, we performed ARS in the presence of a Zeeman-splitting of thequasiparticle density of states in Al. To describe the Zeeman-split ARSspectra, we develop a theoretical model which incorporates the solution to theMaki-Fulde equations into the modified BTK analysis. The method enables thedetermination of the magnitude as well as the sign of \textbf{\textit{P}} withARS, and the results are consistent with those from the zero-field ARS. Theexperiments extend the utility of field-split superconducting spectroscopy fromtunnel junctions to Andreev junctions of arbitrary barrier strengths.

Measurement of the spin polarization of the magnetic semiconductor EuS with zero-field and Zeeman-split Andreev reflection spectroscopy