The Hall coefficient, RH , of the Mott-Hubbard system vanadium sesquioxide has a strong temperature dependence in the barely delocalized metal. As in the case of the cuprate superconductors, we find that the resistivity and the Hall angle of V22yO3 follow different power laws in temperature, implying different longitudinal and transverse scattering mechanisms. Far from half-filling, only one transport scattering rate is needed to describe the data, at which point the temperature dependence of RH disappears. @S0163-1829~98!51922-4# The peculiar temperature dependence of the Hall coefficient in the superconducting cuprates is a striking manifestation of their unconventional normal-state properties. With the magnetic field applied perpendicular to the CuO 2 planes, the Hall coefficient rapidly increases with decreasing temperature, peaking just above the superconducting transition temperature. In studies of Zn-doped 1 and oxygen-reduced 2 YBa2Cu3O72d, Ong and co-workers have demonstrated that parametrization of the data in terms of the Hall angle, u H 5tan 21 (sxy /sxx), reveals two separate relaxation rates for carrier motion. Whereas the planar resistivity varies linearly with T, cot uH;T 2 , implying different longitudinal and transverse ~‘‘Hall’’ ! scattering mechanisms. These experimental results have then been cited as evidence for Anderson’s theoretical picture 3 of the decoupling of spin and charge in a highly correlated, two-dimensional system. We find in the three-dimensional correlated metal, V22yO3, a remarkably similar experimental situation. Vanadium sesquioxide has served as the prototype for the MottHubbard metal-insulator transition, with coincident electronic, magnetic, and structural phase transitions. 4,5 With the magnetic field applied along any arbitrary direction, the Hall coefficient rapidly increases with decreasing temperature in