Physics – Condensed Matter – Superconductivity
Scientific paper
2010-07-19
Phys. Rev. Lett. 105, 207001 (2010)
Physics
Condensed Matter
Superconductivity
4 pages, 1 table and 4 figures
Scientific paper
10.1103/PhysRevLett.105.207001
We report an extensive theoretical analysis of point-contact Andreev reflection data available in literature on ferromagnetic CrO$_2$. We find that the spectra can be well understood within a model of fully spin-polarized bands in CrO$_2$ together with spin active scattering at the contact. This is in contrast to analyses of the data within extended Blonder-Tinkham-Klapwijk models, which lead to a spin polarization varying between 50~\% and 100~\% depending on the transparency of the interface. We propose to utilize both the temperature dependence of the spectra and the excess current at voltages above the gap to resolve the spin-polarization in CrO$_2$ in a new generation of experiments.
Eschrig Matthias
Grein Roland
Lofwander Tomas
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