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Calculated Curie temperatures for RCo2 and RCo2H4 compounds.

Self-consistent electronic-structure calculations have been performed for the ferromagnetic Laves-phase compound GdCo 2 and GdCo 2 H 4 . Experimentally, the magnetic moment for GdCo 2 is only a little reduced when the hydride is formed, but the Curie temperature drops from T c = 395 K to T c =90 K in the hydride. Using parameters that are calculated ab initio (the susceptibility and the exchange coupling) the Curie temperature is calculated from a simple model and found to agree with experiment for GdCo 2