Abstract
In addition to the colossal magnetoresistive manganites introduced in Sect. 4.1, the transition metal oxides with light transition metal ions, such as Ti and V, are recognized to be an alternative class of materials with orbital degrees of freedom. Except for compounds where the formal valence of Ti V is 4+ (5+), such as BaTiO3, TiO2 and V2O5, the electrons occupy the partially degenerate transition metal ion 3d orbitals. For example, with a cubic crystalline field, the five fold degeneracy of the 3d orbitals is split into the e g and t 2g orbitals. The latter, with relatively low in energy, i.e. the 3d xy , 3d yz and 3d zx orbitals, are partially filled by electrons in Ti and V ions.
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Ishihara, S. (2004). Titanates and Vanadates. In: Physics of Transition Metal Oxides. Springer Series in Solid-State Sciences, vol 144. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-09298-9_5
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