| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-767 - C8-768 | |
| DOI | https://doi.org/10.1051/jphyscol:19888346 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-767-C8-768
DOI: 10.1051/jphyscol:19888346
Centre de Recherches sur les Très Basses Températures, CNRS, BP 166X, F-38042 Grenoble Cedex, France
J. Phys. Colloques 49 (1988) C8-767-C8-768
DOI: 10.1051/jphyscol:19888346
THERMAL EXPANSION OF HEAVY-FERMION CeRu2Si2
A. de Visser, P. Haen, P. Lejay et J. FlouquetCentre de Recherches sur les Très Basses Températures, CNRS, BP 166X, F-38042 Grenoble Cedex, France
Abstract
The coefficients of linear thermal expansion of single-crystalline samples of the tetragonal heavy-fermion compound CeRu2Si2, and its non-magnetic analog LaRu2Si2, have been measured in the temperature range 1.5-100 K. The electronic part of the thermal expansion of CeRu2Si2 yields two distinct anomalies : (1) a large positive contribution, caused by the (antiferro)magnetic interactions of the f-moments, centered at 9 K, and (2) a negative crystal-field contribution in the high-temperature regime. The data are compared with existing specific-heat measurements and analysed in terms of Grüneisen parameters. The resulting values for κƉ amount to 150 and -4 Mbar-1 for the spin-fluctuation and crystal-field contribution, respectively.