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Schlagwörter:
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Zusammenfassung:
We present results of low-temperature calorimetric and resistive
measurements on the isostructural heavy-fermion compounds CeCu2Si2 and
CeNi2Ge2. 'Non-Fermi-liquid' effects are established which suggest the
nearness of an antiferromagnetic quantum critical point (QCP) in both
systems. The observed deviations from the properties of a Landau Fermi
liquid (FL) may be related to anomalous energy dependences of both the
quasiparticle mass and the quasiparticle-quasiparticle scattering cross
section. For CeNi2Ge2, a moderately heavy FL can be recovered by
application of moderate values of either magnetic field or hydrostatic
pressure. For p = 1.7 GPa a novel, non-superconducting, phase transition
has been discovered at T-1 similar or equal to 1 K.
