Abstract

The character of the transition that takes place at the N\'eel temperature in CoO, from a cubic paramagnetic phase to a monoclinic antiferromagnetic one, has been studied through the evaluation of the exchange of latent heat. A high-resolution ac photopyroelectric calorimeter has been used to provide qualitative information on this issue, measuring high quality single crystal samples. The results show the presence of a small heat exchange characteristic of a weak first order transition.

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