ITINERANT AND LOCAL-MOMENT ANTIFERROMAGNETISM IN V2-YO3 - A NMR-STUDY

V NMR spectra were measured in insulating and itinerant, antiferromagn etic V2-yO3 (y less than or equal to 0.052) up to the Neel temperature T-N. The remaining V ion of a broken V pair in the V2O3 structure giv es rise to a resolved satellite line. The hyperfine coupling constants at the majority site and at the satellite, as well as the electric-fi eld gradient at the majority sites are nearly the same in the metallic and insulating state. The magnetic states are, therefore, similar in the itinerant and insulating case. The ordering temperature T-N of hig hly doped antiferromagnetic samples is much larger than inferred from susceptibility data. The temperature dependence of the sublattice magn etization is small and equal for insulating and highly doped metallic samples. Below T-N the electric-field gradient of both sites is temper ature independent.