Soft X-ray magnetic circular dichroism study of the ferromagnetic spinel-type Cr chalcogenides

• Published in: Journal of electron spectroscopy and related phenomena Vol. 114; pp. 789 - 793
• Main Authors: Kimura, Akio, Matsuno, Jobu, Okabayashi, Jun, Fujimori, Atsushi, Shishidou, Tatsuya, Kulatov, Erkin, Kanomata, Takeshi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2001
• Subjects: Linear-muffin-tin orbital (LMTO) band structure calculation; Magnetic circular dichroism (MCD); Multiplet calculation; Soft X-ray absorption spectroscopy (XAS); Spinel type Cr chalcogenides; Magnetic circular dichroism (MCD); Soft X-ray absorption spectroscopy (XAS); Linear-muffin-tin orbital (LMTO) band structure calculation; Spinel type Cr chalcogenides; Multiplet calculation
• ISSN: 0368-2048; 1873-2526
• DOI: 10.1016/S0368-2048(00)00332-7

We have observed magnetic circular dichroism (MCD) in the soft X-ray absorption spectra of the semiconducting ferromagnet CdCr 2Se 4 and the metallic ferromagnets CuCr 2S 4 and CuCr 2Se 4. The Cr 2p X-ray absorption and MCD spectra show that the d-electron occupancies of the Cr atom in the Cu-based Cr sulfide and selenide are not much different from that in the CdCr 2Se 4 in spite of the different formal valencies, Cr 3.5+ and Cr 3+, respectively. The observed 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 CuCr 2S 4 and CuCr 2Se 4, consistent with band-structure calculation.