Reduction of ordered moment in strongly correlatedLaTiO3+δupon band filling

Neutron diffraction and magnetic susceptibility experiments were performed on single crystals of the doped Mott-Hubbard insulator ${\mathrm{LaTiO}}_{3+\delta }.$ The magnetic properties of the three-dimensional correlated electron system were investigated upon hole doping. The size of the ordered moment of ${\mathrm{Ti}}^{3+}$ in the canted antiferromagnetically ordered phase reaches a maximum of $0.46\left(2\right)\mathrm{}{\mu }_B$ for ${\mathrm{LaTiO}}_3.$ Upon increasing the band filling, i.e., upon increasing the amount of nonstoichiometric oxygen δ from 0 to ∼0.08, the ordered moment on ${\mathrm{Ti}}^{3+}$ is shown to decrease rapidly. The weak-ferromagnetic saturation moment of ${\mathrm{LaTiO}}_{3.07\left(1\right)\mathrm{}},$ on the verge of the insulator-to-metal transition, is reached via a series of steps in the magnetization curve.