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- W2009666434 abstract "We report measurements of the spin polarization (textbf{textit{P}}) of the concentrated magnetic semiconductor EuS using both zero-field and Zeeman-split Andreev reflection spectroscopy (ARS) with EuS/Al planar junctions. The zero-field ARS spectra are well described by the modified (spin-polarized) BTK model with expected superconducting energy gap and actual measurement temperature (no additional spectral broadening). The fittings consistently yield textbf{textit{P}} close to 80% regardless of the barrier strength. Moreover, we performed ARS in the presence of a Zeeman-splitting of the quasiparticle density of states in Al. To describe the Zeeman-split ARS spectra, we develop a theoretical model which incorporates the solution to the Maki-Fulde equations into the modified BTK analysis. The method enables the determination of the magnitude as well as the sign of textbf{textit{P}} with ARS, and the results are consistent with those from the zero-field ARS. The experiments extend the utility of field-split superconducting spectroscopy from tunnel junctions to Andreev junctions of arbitrary barrier strengths." @default.
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- W2009666434 date "2007-05-29" @default.
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- W2009666434 title "Measurement of the spin polarization of the magnetic semiconductor<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>EuS</mml:mi></mml:mrow></mml:math>with zero-field and Zeeman-split Andreev reflection spectroscopy" @default.
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- W2009666434 doi "https://doi.org/10.1103/physrevb.75.205208" @default.
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