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Abstract:
We have investigated the effect of pressure and magnetic field on the
specific heat of CeCu2Si2 and CeNi2Ge2, two undoped compounds close to
an antiferromagnetic (afm) quantum critical point. In a CeCu2Si2 sample
showing an afm phase at p = 0, application of a pressure of p = 0.7 GPa
results in a replacement of this phase by superconductivity and to
non-Fermi-liquid (NFL) behaviour in C/T. In CeNi2Ge2 the NFL behaviour
present at p = 0 is suppressed by either a magnetic field B = 8 T or a
pressure p = 1.3 GPa. For both compounds, the NFL effects are consistent
(as T --> 0) with C/T = gamma(0) - alpha T-1/2 as expected when T-N -->
0.
