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Specific heat of dysprosium gallium garnet between 37 mK and 2 K |
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| Authors: | J. Filippi J.C. Lasjaunias A. Ravex F. Tchéou J. Rossat-Mignod |
| Affiliation: | Laboratoire de Magnétisme, C.N.R.S., 166 X, 38042 Grenoble-Cédex, France;Centre de Recherche sur les Très Basses Températures, C.N.R.S., 166X, 38042 Grenoble-Cédex, France;Laboratoire de Diffraction Neutronique, Départment de Recherche Fondamentale, Centre d''Etudes Nucléaires, 85X, 38041 Grenoble-Cédex, France |
| Abstract: | The specific heat of a single crystal of dysprosium gallium garnet (Dy GaG) has been measured between 37 mK and 2 K using a double-stage demagnetization cryostat. An antiferromagnetic ordering occurs at TN = 0.373 K. The value of the entropy at 2 K indicates that the ground state is a Kramers doublet. At lower temperatures, a hyperfine contribution is seen. The anomalously large specific heat observed above 0.4 K is interpreted in terms of the lambda-anomaly tail and a short range contribution with a rounded maximum at about 0.7 K. |
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