Is CrO${}_2$ Fully Spin-Polarized? - Analysis of Andreev Spectra and Excess Current

Abstract

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.

4 pages, 1 table and 4 figures

References in corpus (2)

• Half-metallic ferromagnets: From band structure to many-body effects
• A spin triplet supercurrent through the half-metallic ferromagnet CrO2

Cited by in corpus (4)

• Nonlocal Thermoelectric Effects and Nonlocal Onsager Relations in a Three-Terminal Proximity-Coupled Superconductor-Ferromagnet Device
• Odd-frequency superconducting states with different types of Meissner response: Problem of coexistence
• P-wave Cooper pair splitting
• Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra