Abstract
In many vanadium and titanium oxides the transition metal ions are surrounded by oxygen octahedra which are only weakly distorted. This can result in an orbital degeneracy in the Mott insulating phase in addition to the spin degeneracy. An example is V2O3, where as pointed out by Castellani, Natoli and Ranninger, the sign and magnitude of the superexchange spin-spin couplings are dependent on the orbital occupancy. The interaction between orbital and spin degrees of freedom is strong and mutually frustrating so that the paramagnetic phases may have strong spin and orbit fluctuations unrelated to the ordered phase and the magnetic ordering transition is strongly first order.
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© 1995 Springer-Verlag Berlin Heidelberg
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Rice, T.M. (1995). Orbital-Spin Coupling in V2O3 and Related Oxides. In: Spectroscopy of Mott Insulators and Correlated Metals. Springer Series in Solid-State Sciences, vol 119. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-57834-2_20
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DOI: https://doi.org/10.1007/978-3-642-57834-2_20
Publisher Name: Springer, Berlin, Heidelberg
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