ITINERANT ANTIFERROMAGNETISM IN THE MOTT COMPOUND V1.973O3

The doping-induced metallic state of the Mott system V2-yO3 has spin-d ensity-wave order for T<T-N approximate to 9 K. Dynamic spin correlati ons in such a cation-deficient sample. V1.973O3. were measured with in elastic neutron scattering throughout the Brillouin zone for energies up to similar to 20k(B)T(N) and temperatures up to similar to 20T(N). The dynamic spin-correlation function, S(q.w). consists of a single ri dge as a function of <(h)over bar omega> centered at each antiferromag netic Bragg point. The q, omega. and T dependence of magnetic fluctuat ions can be described by the self-consistent renormalization theory fo r weak itinerant antiferromagnets developed by Moriya, Hasegawa, and N akayama. Thermodynamic properties below similar to 10T(N) are quantita tively accounted for by this theory in its simplest form with only fou r parameters, which are determined by our neutron-scattering experimen t.