| In many transition metal oxides of interest, large intrinsic atomic spin-orbit coupling is almost completely 'quenched' when the transition metal ion is in the lattice. This means that determining the magnitude of the small residue is difficult, and k-resolved experimental data are at a premium. I will begin by discussing the contributions that can be made by combining accurate angle resolved photoemission spectroscopy with electronic structure calculations. I will then describe how the de Haas - van Alphen effect can be used to obtain theory-independent measures of some manifestations of spin-orbit coupling. In the spirit of a workshop the latter part will be a mix of hard evidence and speculation. |
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