Local electronic and magnetic properties of ferro-orbital-ordered FeV2O4. (3rd August 2018)

• Record Type: Journal Article
• Authors: Okabayashi, Jun; Miyasaka, Shigeki; Takahashi, Masashi; Tajima, Setsuko
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 9(2018)
• Publication Date: 2018-08-03
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.0902BD
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Local magnetic structures of spinel-type FeV2 O4 were investigated using X-ray absorption and X-ray magnetic circular dichroism (XMCD) spectroscopies for V and Fe sites and Mössbauer spectroscopy for Fe sites. XMCD spectra reveal that the Fe 2+ (d 6 ) and V 3+ (d 2 ) states are coupled antiferromagnetically. From the analyses of XMCD spectra using magneto-optical sum rules, we deduced that small but finite orbital magnetic moments remain in the V 3d states, which accounts for the ferro-orbital ordering in the V sites of FeV2 O4 with both the complex and real orbital states coexisting accompanied by the distortion of Fe sites. X-ray absorption fine structure spectra supports the deduction that the Fe 2+ and V 3+ states remain unchanged during the structural phase transitions. Mössbauer spectra also suggest that the Jahn–Teller distortion in Fe sites can be a driving force in ferro-orbital ordering.