Spin-orbital entangled states in correlated molybdenum oxides

We theoretically explore how the spin-orbit coupling could give rise to unusual states of spin-orbital or spin-lattice degrees of freedom depending on the local d-electron counting and the lattice geometry. We discuss d¹ and d² transition metal compounds, such as molybdenum oxides with double perovskite and pyrochlore structures, as candidate materials and consider available experimental rezults from this perspective.

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