Quantum Versus Jahn-Teller Orbital Physics in YVO${}_3$ and LaVO${}_3$

Abstract

We argue that the large Jahn-Teller (JT) distortions in YVO${}_3$ and LaVO${}_3$ should suppress the quantum orbital fluctuation. The unusual magnetic properties can be well explained based on LDA+$U$ calculations using experimental structures, in terms of the JT orbital. The observed splitting of the spin-wave dispersions for YVO${}_3$ in C-type antiferromagnetic state is attributed to the inequivalent VO${}_2$ layers in the crystal structure, instead of the ``orbital Peierls state''. Alternative stacking of $ab$-plane exchange couplings produces the c-axis spin-wave splitting, thus the spin system is highly three dimensional rather than quasi-one-dimensional. Similar splitting is also predicted for LaVO${}_3$, although it is weak.

4 pages, 2 tables, 2 figures, (accepted by PRL)

References in corpus (3)

• Orbital-Spin Structure and Coupling to Lattice in RTiO${}_3$ with R=La,Pr,Nd and Sm
• Structural, electronic, and magneto-optical properties of YVO${}_3$
• One-Dimensional Confinement and Enhanced Jahn-Teller Instability in LaVO${}_3$

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