Reduction of Ordered Moments in Strongly Correlated LaTiO(3+delta) upon Band Filling

Neutron diffraction and magnetic susceptibility experiments were performed on single crystals of the doped Mott--Hubbard insulator LaTiO(3+delta). The magnetic properties of the three-dimensional correlated electron system were investigated upon hole doping. The size of the ordered moment of Ti**3+ in the canted antiferromagnetically ordered phase reaches a maximum of 0.46(2)mu(B) for LaTiO(3). Upon increasing the band filling, i.e., upon increasing the amount of nonstoichiometric oxygen delta from 0 to ~0.08, the ordered moment on Ti**3+ is shown to decrease rapidly. The weak-ferromagnetic saturation moment of LaTiO(3.07(1)), on the verge of the insulator--to--metal transition, is reached via a series of steps in the magnetization curve.