We explore the effect of pressure on the electronic properties of the ferromagnetic Mott-Hubbard insulator $\mathrm{Y}\mathrm{Ti}{\mathrm{O}}_3$. We show that the pressure-induced insulator-metal transition is accompanied by anisotropic structural changes driven by the competition between strongly orbital dependent one-electron hopping and strong, multiorbital electronic correlations in the real crystal structure of $\mathrm{Y}\mathrm{Ti}{\mathrm{O}}_3$. Our results are relevant for the general understanding of the intricate and interdependent changes in the orbital and magnetic structure of correlated ferromagnetic insulators showing Mott transitions.

• Received 11 September 2007

DOI:https://doi.org/10.1103/PhysRevB.77.075108