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Schlagwörter:
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Zusammenfassung:
Elastic and inelastic neutron-scattering studies on the system
Ce(Cu1-xNix)2Ge2 are reported. These measurements are complemented by
measurements of the magnetic susceptibility, high-field magnetization,
heat capacity, thermal expansion, electrical resistivity and
thermopower. The results reveal an interesting T-x phase diagram
consisting of two different antiferromagnetic phases for x < 0.2 and 0.2
< x < 0.75, respectively, and a heavy-Fermi-liquid regime at higher Ni
concentrations. The experimental results are interpreted in terms of an
alloying-induced transition from local-moment to itinerant heavy-fermion
magnetism. Fingerprints of this latter phase are a strongly reduced
ordered moment and a short incommensurate ordering wave vector, in
accord with theoretical predictions. A surprisingly good agreement
between theory and experiment is found for x > 0.5. Further
experimental evidence for different types of antiferromagnetic ordering
derives from a line-shape analysis of the quasielastic
neutron-scattering intensity, from magnetization and thermopower
experiments.
