Year: 2009
Type: article
Abstract: We report on a new method to determine the degree of bulk spin polarization in single crystal ${\mathrm{Co}}_{(1\ensuremath{-}x)}{\mathrm{Fe}}_{x}{\mathrm{S}}_{2}$ by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for ${\mathrm{CoS}}_{2}$ and ${\mathrm{Co}}_{0.9}{\mathrm{Fe}}_{0.1}{\mathrm{S}}_{2}$. The ab initio calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, $P$, corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the refined calculations. The values were found to be $P=\ensuremath{-}72\ifmmode\pm\else\textpm\fi{}6%$ and $P=18\ifmmode\pm\else\textpm\fi{}7%$ for ${\mathrm{CoS}}_{2}$ and ${\mathrm{Co}}_{0.9}{\mathrm{Fe}}_{0.1}{\mathrm{S}}_{2}$, respectively. Furthermore, determinations of $P$ weighted by the Fermi velocity (${v}_{F}$ or ${v}_{F}^{2}$) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of $P$ on ${v}_{F}$.
Source: Physical Review Letters
Authors: C. Utfeld, S. R. Giblin, J. W. Taylor, J. A. Duffy, C. Shenton-Taylor, J. Laverock, S. B. Dugdale, M. Manno, C. Leighton, M. Itou, Y. Sakurai
Language: Latvian
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1921092639