MAGNETIC-ANISOTROPY IN THE SDW STATE OF METALLIC V2-YO3 OBSERVED BY MAGNETOTRANSPORT MEASUREMENTS ON ORIENTED SINGLE-CRYSTALS

The compound V2O3 is often considered to be a Mott-Hubbard insulator a t low temperatures. The development of a spin-density wave (SDW) in sa mples with V-deficiency, i.e. upon hole-doping of the stoichiometric s ystem, is regarded to corroborate this view. This transition into a me tallic antiferromagnetic state at T-N = 10 K leads to a minimum in the resistivity. We show that this minimum varies only slightly when an e xternal magnetic field is applied (Delta T-N = -1 K for B = 12 T). The Hall resistivity is linear in field and the Hall constant RH shows a strong temperature dependence with a maximum at about T-N. For T < T-N the magnetoresistance is negative and we observe metamagnetic behavio r, which depends on the orientation of the magnetic field with respect to the crystal axes.