Abstract
Calorimetric measurements between 0.3 and 10 K have been made on a single crystal of the AuCu 3 -type cubic compound ErGa 3 . The temperature dependence of specific heat exhibits an antiferromagnetic ordering-induced peak near 2.7 K, a second peak at 2.5 K due to spin reorientation, and a Schottky anomaly with crystal-field parameters x=0.17 and W=0.22 K, all in agreement with the results from neutron studies. The sum of the calculated entropies associated with the order-disorder process (R In 2) and the crystal-field effect, respectively, is lower by 0.1R than the experimentally derived magnetic entropy values at approximately 6-10 K. This difference provides an estimate of a 2-J/mol latent heat for the spin rotation process. An anticipated transition from an amplitude-modulated magnetic structure to an equal magnetic-moment structure at temperatures near T N /2 was not observed.
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