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We report on a detailed comparison of the thermodynamic properties of the heavy-fermion system CeCu6 which can be described as a Fermi liquid at low temperatures T < 0.1 K, and CeCus.9Auo.l where strong deviations from the Fermi-liquid behaviour were found previously in the T dependence of the specific heat C , magnetization M and electrical resistivity p. The specific heat, magnetization and elastic constants are investigated in a large range of magnetic fields, corroborating the idea that the non-Fermi-liquid behaviour arises from low-lying spin excitations. For the elastic constants, a striking linear T dependence is found for CeCus 9Auo I in contrast to the T2 Fermiliquid behaviour of CeCus.

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