J. Phys. IV France 123 (2005) 95-100
Superconductivity and ferromagnetism in BM5Se9 (B = Al, Ga, Ge, Sn, Sb; M = V, Nb, Ta)A. Leblanc-Soreau and P. Molinié
IMN-CNRS, UMR 6502, 2 rue de la Houssiniére, BP. 32229, 44322 Nantes Cedex 3, France
An original process allows the dissolution of some intermetallic A15 phases in lamellar metallic diselenides. Thus exists a new derivative family BM5Se9 obtained from 2H-NbSe2, 2H-TaSe2 and 1T-VSe2. In addition to the "AA-BB" or "AB-AB" stacking modes, another part played by the matrix is underlined : if it possess a metal excess, it changes the properties and leads to formation of new phases, and the entities issued from A15 dissolution determine the properties through a synergy between them and the matrix . The phases GaNb5Se9, SbNb5Se9, (Ge/Al)Nb5Se9, SnNb5Se9 and SnNb0.5Ta4.5Se9 are superconductors whereas GaV5Se9 is ferromagnetic. Compounds presented in this work are not multi-layer systems but rather, they are hybrid and mesoscopic materials.
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