CASTEP LDA+U calculations are only available in the spin-polarized mode, even if there is no magnetic solution. The majority of correlated systems are either ferrimagnetic or anti-ferromagnetic,
The LDA+U formalism can only be used for the Energy task. It is not compatible with stress, NMR, phonon, or polarizability calculations. The formalism cannot be used with mixture atoms or real-space pseudopotentials.
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