Abstract
The dissolution of some intermetallic A15 compounds in lamellar metallic diselenides (2H-NbSe2, 2H-TaSe2 and 1T-VSe2) results in original phases. Syntheses performed in the Nb3Sn/NbSe2, Nb3Ge/NbSe2, Nb3Sn/TaSe2, V3Ga/NbSe2, Nb3Sb/NbSe2 V3Ga/VSe2 systems lead to the formation of the BM5Se9 phases ( superconductors or ferromagnets). The Tc values vary from 17.5(2) K for SnNb5Se9 to 4.5(2) K for GeNb5Se9. For the ferromagnet GaV5Se9, the ESR study shows two vanadium sites with axial symmetries. Previous results in Mössbauer and Raman studies showing the existence of B-M entities, are in agreement with the Mössbauer ones obtained on SnNb5Se9 which could be obtained without any superconducting behaviour. The comparison could be done between the 3 superconductors GaNb5Se9, SnNb5Se9, SnNb0.5Ta4.5Se9 and the 3 ferromagnets GaV5Se9, Sn0.94Ga0.05Nb4.70V0.30Se9, GaV0.15Ta4.85Se9, the presence of V probably modifies the superconducting exchanges and allows ferromagnetic couplings. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Published Version
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