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Bulk spin polarization of Co(1-x)FexS2

Utfeld, C., Giblin, Sean ORCID:, Taylor, J. W., Duffy, J. A., Shenton-Taylor, C., Laverock, J., Dugdale, S. B., Manno, M., Leighton, C., Itou, M. and Sakurai, Y. 2009. Bulk spin polarization of Co(1-x)FexS2. Physical Review Letters 103 (22) , pp. 226403-226406. 10.1103/PhysRevLett.103.226403

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We report on a new method to determine the degree of bulk spin polarization in single crystal Co(1-x)FexS2 by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for CoS2 and Co0.9Fe0.1S2. 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=-72±6% and P=18±7% for CoS2 and Co0.9Fe0.1S2, respectively. Furthermore, determinations of P weighted by the Fermi velocity (vF or vF2) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of P on vF.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Physical Society
ISSN: 0031-9007
Last Modified: 21 Oct 2022 10:50

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