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  Local-moment and itinerant antiferromagnetism in the heavy-fermion system Ce(Cu1−xNix)2Ge2

Loidl, A., Krimmel, A., Knorr, K., Sparn, G., Lang, M., Geibel, C., et al. (1992). Local-moment and itinerant antiferromagnetism in the heavy-fermion system Ce(Cu1−xNix)2Ge2. Annalen der Physik, 1(2), 78-91. doi:10.1002/andp.19925040203.

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Loidl, A.1, Author
Krimmel, A.1, Author
Knorr, K.1, Author
Sparn, G.1, Author
Lang, M.1, Author
Geibel, C.1, Author
Horn, S.1, Author
Grauel, A.1, Author
Steglich, F.2, Author           
Welslau, B.1, Author
Grewe, N.1, Author
Nakotte, H.1, Author
de Boer, F. R.1, Author
Murani, A. P.1, Author
Affiliations:
1external, ou_persistent22              
2External Organizations, ou_persistent22              

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 Abstract: 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.

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 Dates: 1992-09-02
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: A1992HU88400002
DOI: 10.1002/andp.19925040203
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Title: Annalen der Physik
  Other : Ann. Phys.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 1 (2) Sequence Number: - Start / End Page: 78 - 91 Identifier: Other: 0003-3804
CoNE: https://pure.mpg.de/cone/journals/resource/954925379961