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The effect of disorder on a class of transition metal oxides described by asingle orbital Hubbard model at half filling is investigated. The phases arecharacterized by the nature of the electronic and spin excitations. Thefrequency and temperature-dependent conductivity and spin susceptibility asfunctions of disorder are calculated. The interplay of disorder andelectron-electron interaction produces unusual behavior in this system. Forexample, the dc conductivity, which is vanishingly small at low disorder in theMott phase and at high disorder in the localized phase, gets surprisinglyenhanced at intermediate disorder in a "metallic" phase. Moreover, the spinsusceptibility in this "metallic" phase is not the expected Pauli-behavior butCurie-$1/T$ due to the presence of local moments.

Conductivity and Spin Susceptibility for the Disordered 2D Hubbard Model