- Autor(in)
- Sponsor(in)
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Deutschland. Bundesministerium für Forschung und Technologie
Sonderforschungsbereich Elektronisch Hochkorrelierte Metallische Materialien
- Referenz
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- Seitenbereich
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0078 - 0091
- Schlagwort(e)
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<KWD>Kondo lattices
Heavy fermions
Magnetism
- Zusammenfsg.
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Elastic and inelastic neutron-scattering studies on the system Ce(Cu<sub>1-x</sub>Ni<sub>x</sub>)<sub>2</sub>Ge<sub>2</sub> 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 <I>T-x</I> phase diagram consisting of two different antiferromagnetic phases for <I>x</I> < 0.2 and 0.2 < <I>x</I> < 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 <I>x</I> > 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.