A. Kimura et al., Soft x-ray magnetic circular dichroism study of the ferromagnetic spinel-type Cr chalcogenides - art. no. 224420, PHYS REV B, 6322(22), 2001, pp. 4420
We have observed magnetic circular dichroism (MCD) in the soft x-ray absorp
tion spectra of the semiconducting ferromagnet CdCr2Se4 and the metallic fe
rromagnets CuCr2S4 and CuCr2Se4. The Cr 2p x-ray absorption and MCD spectra
show that the d-electron occupancies of the Cr atom in the Cu based Cr sul
fide and selenide are not much different from that in the CdCr2Se4 in spite
of the different formal valencies Cr3.5+ and Cr3+ respectively. The observ
ed Cu 2p MCD spectra show the existence of small magnetic moments on the Cu
sites which are aligned antiparallel to the Cr 3d moment in CuCr2S4 and Cu
Cr2Se4, consistent with band-structure calculation.