Highly converged local-spin-density-approximation (LSDA) calculations for ferromagnetic hcp Gd have been perfomed using an extended general-potential linearized augmented-plane-wave method.These calculations are used to assess the adequacy of the LSDA for this material. It is found that, while the calculated ground-state properties are in better agreement with experiment than is the case for elements with open 4f shells, the LSDA does not provide a fully satisfactory description of this material.On the other hand, an analysis of the electronic structure suggests that a model with localized f electrons is unsuitable for Gd.
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