Abstract
Magnetization measurements performed below 1 K on a single-crystalline sample of the heavy fermion compound CeRu2Si2 are reported. The field variation of the linear term of the specific heat γ derived from these data (via a Maxwell relation) exhibits a large peak at the metamagnetic-like transition at B* (=7.7 atT → 0). Thermal-expansion measurements, show a drastic drop of the temperature where a Fermi liquid behavior is reached whenB →B*. Similar experiments performed on a single-crystalline Ce0.95La0.05Ru2Si2 sample show a broadening of all the anomalies atB* and a reduction of their intensities. These results strongly suggest that pure CeRu2Si2 approaches a magnetic instability atB* forT → 0.
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Paulsen, C., Lacerda, A., Puech, L. et al. Low-temperature properties of the heavy-fermion compound CeRu2Si2 at the metamagnetic transition. J Low Temp Phys 81, 317–339 (1990). https://doi.org/10.1007/BF00682274
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DOI: https://doi.org/10.1007/BF00682274