Orbital liquid in three dimensional Mott insulator: $LaTi{O}_3$

Abstract

We present a theory of spin and orbital states in Mott insulator $LaTi{O}_3$. The spin-orbital superexchange interaction between $d^1(t_{2g})$ ions in cubic crystal suffers from a pathological degeneracy of orbital states at classical level. Quantum effects remove this degeneracy and result in the formation of the coherent ground state, in which the orbital moment of $t_{2g}$ level is fully quenched. We find a finite gap for orbital excitations. Such a disordered state of local degrees of freedom on unfrustrated, simple cubic lattice is highly unusual. Orbital liquid state naturally explains observed anomalies of $LaTi{O}_3$.

5 pages, 3 figures

References in corpus (3)

• Spin Dynamics and Orbital State in LaTiO_3
• Interplay between orbital ordering and lattice distortions in LaMnO3, YVO3, and YTiO3
• Orbital order out of spin disorder: How to measure the orbital gap

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