Specific heat in Erbium and Yttrium Iron garnet crystals |
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| Authors: | M. Guillot, F. Tché ou, A. Marchand, P. Feldmann R. Lagnier |
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| Affiliation: | (1) Laboratoire Louis Néel, CNRS, 25, Avenue des Martyrs, 166X, F-38042 Grenoble, France;(2) DRF/DN, Centre d'Etudes Nucléaires, Grenoble, France;(3) Magnétisme et Optique des Solides, CNRS, Meudon Bellevue, France;(4) Service des Basses Températures, Centre d'Etudes Nucléaires, 25, Avenue des Martyrs, 166X, F-38042 Grenoble, France;(5) Laboratoire associé à l'Université Scientifique et Médicale de Grenoble, France |
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| Abstract: | Specific heat measurements have been carried out on single crystals of Erbium and Yttrium Iron garnets between 5 and 210K. The ErIG specific heat presents two anomalies. The first one situated at (77±4)K corresponds approximatively to the compensation temperature at which the bulk magnetization vanishes; the second one was found at (54±2)K below which temperature the |100| direction appears to be the easy direction. Both anomalies are to be associated with second order transitions and correspond to the onset of an umbrella structure and a change of the easy direction. |
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