Abstract
The specific heat of a ferrimagnet Co 2 TiO 4 which has a spinel structure was measured between 2°K and room temperature. An anomalous heat due to a magnetic transition was observed. The Curie temperature is found to be 49.0°K. The total entropy of the transition is approximately Rln8 which suggests that the degeneracies of ground states of Co 2+ ions in tetrahedral and octahedral sites are fourfold and twofold respectively. The Debye temperature is 560°K. The observed magnetic specific heat below about 30°K shows the modified T 3/2 dependence which is predicted from the spin wave theory taking into account the anisotropy energy, except at very low temperature. The effective anisotropy field, 2 K / M S , is 4.8×10 4 Oe. The absolute magnitude of the exchange Interaction of the spin, 3/2, of a Co 2+ ion in a tetrahedral site with the fictitious spin, 1/2, of a Co 2+ ion in an octahedral site, J A B ', is evaluated to be 3.23 k B .
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