Structure cristalline et propriétés physiques électriques et magnétiques des phases M0.50NbSe2 (M = Ti,V, Cr)

The structure of M_0.50NbSe₂ (M = Ti, V, Cr) phases is reported. A detailed crystal structure analysis has been performed on Cr_0.50NbSe₂. Large single crystals were grown by chemical transport reaction with bromine as the transport agent. Electrical and magnetic properties have been measured in the 4.2–300°K range. Susceptibilities of both Cr_0.50NbSe₂ and Ti_0.50NbSe₂ follow the Curie-Weiss law. At low temperature (T < 53°K) an antiferromagnetic ordering is observed for Cr_0.50NbSe₂. V_0.50NbSe₂ exhibits a temperature-independent paramagnetism. Transport properties of M_0.50NbSe₂ phases are consistent with their metallic behavior and show several transitions at low temperature. The physical properties are discussed along with the reported crystal structure.