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Thermal expansion and the Grüneisen parameter near the magnetic instability in

The low-temperature thermal expansion of the heavy-fermion system with the formula (x = 0 and x = 0.05) close to the magnetic instability is analysed in terms of the renormalization group and self-consistent renormalized spin-fluctuation models. The Grüneisen parameter calculated using the renormalized Fermi temperature is compared with the effective one which is determined from thermal expansion measurements and previously obtained specific heat data.