The electrical resistivities of Fe-Co alloys owing to random alloy disorder are calculated using the Kubo-Greenwood formula. The obtained electrical esistivities agree well with experimental data quantitatively at low temperature. The spin-polarization of Fe50Co50 estimated from the conductivity (86%) has opposite sign to that from the densities of the states at the Fermi level (-73%). It is found that the conductivity is governed mainly by s-electrons, and the s-electrons in the minority spin states are less conductive due to strong scattering by the large densities of the states of d-electrons than the majority spin electrons.
@article{arxiv.0903.3842,
title = {Spin-polarized electronic structures and transport properties of Fe-Co alloys},
author = {Yohei Kota and Tomohiro Takahashi and Hiroki Tsuchiura and Akimasa Sakuma},
journal= {arXiv preprint arXiv:0903.3842},
year = {2009}
}