Reduction of ordered moment in strongly correlated LaTiO3+δ upon band filling

Neutron diffraction and magnetic susceptibility experiments were performed on single crystals of the doped Mott-Hubbard insulator LaTiO3+delta. The magnetic properties of the three-dimensional correlated electron system were investigated upon hole doping. The size of the ordered moment of Ti3+ in the canted antiferromagnetically ordered phase reaches a maximum of 0.46(2) mu(B) for LaTiO3. Upon increasing the band filling, i.e., upon increasing the amount of nonstoichiometric oxygen delta from 0 to similar to 0.08, the ordered moment on Ti3+ is shown to decrease rapidly. The weak-ferromagnetic saturation moment of LaTiO3.07(1), on the verge of the insulator-to-metal transition, is reached via a series of steps in the magnetization curve. [S0163-1829(99)00318-5].