Double antiferromagnetism in heusler-type alloys Fe2+xV1-xSi

• Published in: Journal of the Physical Society of Japan 2006-09, Vol.75 (9)
• Main Authors: MATSUDA, Hiroko, ENDO, Keizo, TOKIYAMA, Masahumi, SHINMEN, Hiroshi, TAKANO, Yoshihiko, MASUBUCHI, Shinnichi, OOIWA, Kiyoshi, MITAMURA, Hiroyuki, ARAI, Juichiro, GOTO, Tsuneaki
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Mössbauer effect; other γ-ray spectroscopy; Nuclear magnetic resonance and relaxation; Physics; Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/jpsj.75.094714

Measurements of transport and magnetic properties, 57Fe-Mössbauer spectroscopy and 51V-NMR were performed for a Heusler-type alloy series Fe2+xV1-xSi (0.00≤x≤0.08). In Fe2VSi (x=0.00), which had been reported to be an antiferromagnetic metal with the Néel temperature TN1=123 K, another antiferromagnetic transition was found at 34 K (TN2). The Néel temperature TN1 was found for the alloys with x less than 0.08: it decreased monotonically with increasing x. The new antiferromagnetic transition temperature TN2 was also found for x=0.02 at 64 K. The characteristic hysteresis observed in the magnetization curve below TN2 was macroscopic evidence for the occurrence of another antiferromagnetic ordering. The presence of two types of magnetic transition at ∼40 and ∼120 K for Fe2VSi was confirmed microscopically by Mössbauer spectroscopy. The Mössbauer and NMR measurements showed the presence of slight Fe/V antisite disorder, which plays an important part in the magnetic order below TN2. The magnetic structure of Fe2VSi was discussed and the idea of double antiferromagnetism was proposed.