The spin-polarized electron momentum distributions in the Cr-based chalcogenide spinels Fe1-xCuxCr2S4 (x=0.0,0.5,1.0) have been measured using a magnetic Compton scattering technique at T=10 K. The experimental magnetic Compton profiles have been compared with the results from electronic structure calculations performed using the full potential linearized augmented plane-wave method. The theoretical analysis includes a decomposition of the various orbital and atomic contributions. For x=0.0 and 0.5 sample compositions, the results show that the magnetic moments of the tetrahedrally coordinated Fe2+ (for x=0.0) and Fe3+ (for x=0.5) with spin moments of 3.66mu(B) (for x=0.0) per formula unit (FU-1) and 1.6mu(B) FU-1 (for x=0.5), are aligned antiparallel to those of the octahedrally coordinated Cr3+ with spin moments of 5.0mu(B) FU-1 (for x=0.0) and 4.82mu(B) FU-1 (for x=0.5). In the ferromagnetic system for x=1.0, the Cr moment is found to be 5.28mu(B) FU-1.
|Number of pages||1|
|Journal||Physical Review B|
|Early online date||1 Sept 2002|
|Publication status||Published - 1 Sept 2002|