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APS » Journals » Phys. Rev. B » Volume 40 » Issue 16
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Phys. Rev. B 40, 11429–11432 (1989)

Volume effect at the metamagnetic transition in CeRu2Si2

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A. Lacerda, A. de Visser, L. Puech, P. Lejay, P. Haen, and J. Flouquet
Centre de Recherches sur les Très Basses Températures, Centre National de la Recherche Scientifique, Bôte Postale 166 X, 38042 Grenoble CEDEX, France

J. Voiron and F. J. Okhawa
Laboratoire Louis-Néel, Centre National de la Recherche Scientifique, Bôte Postale 166 X, 38042 Grenoble CEDEX, France

Received 5 September 1989; published in the issue dated 1 December 1989

Thermal-expansion (α) measurements performed in magnetic fields down to 1.3 K on the heavy-fermion compound CeRu2Si2 show that the temperature at which the extremum in α occurs has a deep minimum at the metamagnetic transition (B*=7.8 T). In agreement with scaling theory, the change of sign in α occurs for B≃B*. A Kondo collapse model with ferromagnetic molecular field partially explains the results. However, ferromagnetic fluctuations may play the major role in the field enhancement of the effective mass at B*. .AE

© 1989 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.40.11429
DOI:
10.1103/PhysRevB.40.11429
PACS:
65.70.+y, 71.28.+d, 75.30.Kz, 75.30.Mb
 
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