Utfeld, C., Giblin, S. R., 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, Vol.103 (No.22). Article no. 226403. doi:10.1103/PhysRevLett.103.226403

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Abstract

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 (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).

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	27 November 2009
Dates:	Date Event 27 November 2009 Published
Volume:	Vol.103
Number:	No.22
Number of Pages:	4
Page Range:	Article no. 226403
DOI:	10.1103/PhysRevLett.103.226403
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	NSF MRSEC
Grant number:	DMR-0212302, DMR-0819885

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