Spin polarization of (Ga,Mn)As measured by Andreev Spectroscopy: The role of spin-active scattering

Abstract

We investigate the spin-polarization of the ferromagnetic semiconductor (Ga,Mn)As by point contact Andreev reflection spectroscopy. The conductance spectra are analyzed using a recent theoretical model that accounts for momentum- and spin-dependent scattering at the interface. This allows us to fit the data without resorting, as in the case of the standard spin-dependent Blonder-Tinkham-Klapwijk (BTK) model, to an effective temperature or a statistical distribution of superconducting gaps. We find a transport polarization PC{\approx}57%, in considerably better agreement with the k{\cdot}p kinetic-exchange model of (Ga,Mn)As, than the significantly larger estimates inferred from the BTK model. The temperature dependence of the conductance spectra is fully analyzed.

4 pages, 3 figures

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• Systematic study of magnetic linear dichroism and birefringence in (Ga,Mn)As
• Inverse proximity effect and influence of disorder on triplet supercurrents in strongly spin-polarized ferromagnets
• Theory of Andreev Bound States in S-F-S Junctions and S-F Proximity Devices
• Enhancement of thermoelectric effect in diffusive superconducting bilayers with magnetic interfaces
• Andreev spectroscopy of CrO${}_2$ thin films on TiO${}_2$ and Al${}_2$O${}_3$
• Charge transfer statistics of transport through Majorana bound states
• Kondo effect and spin-active scattering in ferromagnet-superconductor junctions
• Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra
• P-wave Cooper pair splitting
• A $\pi$-shaped Quantum Device for Implementation of Bell States in Solid State Environment