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Dorolti, E., Cario, L., Corraze, B., Janod, E., Vaju, C., Koo, H.-J., Kan, E. & Whangbo, M.-H. (2010) Half-Metallic Ferromagnetism and Large Negative Magnetoresistance in the New Lacunar Spinel GaTi3VS8. J. Am. Chem. Soc. 132 5704–5710.
Added by: Laurent Cournède (2016-03-10 21:37:32) |
| Type de référence: Article DOI: 10.1021/ja908128b Numéro d'identification (ISBN etc.): 0002-7863 Clé BibTeX: Dorolti2010 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: crystal, disordered-systems, gata4se8, gav4s8, low-temperature conductivity, Mott insulator, possible superconductivity, pseudopotentials Créateurs: Cario, Corraze, Dorolti, Janod, Kan, Koo, Vaju, Whangbo Collection: J. Am. Chem. Soc. |
Consultations : 1/544
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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The lacunar spinel compounds GaTi4-xNxS8 (0 {<} x {<} 4), consisting of Ti4-xVx tetrahedral clusters, were prepared and their structures were determined by powder X-ray diffraction. The electronic structures of GaTi4-xVxS8 (x = 0, 1, 2, 3) were examined by density functional calculations, and the electrical resistivity and magnetic susceptibility of these compounds were measured. Our calculations predict that GaTi3VS8 is a ferromagnetic half-metal, and this prediction was confirmed by magnetotransport experiments performed on polycrystalline samples of GaTi3VS8. The latter reveal a large negative magnetoresistance (up to 22\% at 2 K), which is consistent with the intergrain tunnelling magnetoresistance expected for powder samples of a ferromagnetic half-metal and indicates the presence of high spin polarization greater than 53\% in GaTi3VS8.
Added by: Laurent Cournède |