Alloying experiments on heavy fermion compounds

Steglich, F.; Ahlheim, U.; Schank, C.; Geibel, C.; Horn, S.; Lang, M.; Sparn, G.; Loidl, A.; Krimmel, A.

doi:10.1016/0304-8853(90)90105-Y

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Alloying experiments on heavy fermion compounds

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Steglich, F., Ahlheim, U., Schank, C., Geibel, C., Horn, S., Lang, M., et al. (1990). Alloying experiments on heavy fermion compounds. Journal of Magnetism and Magnetic Materials, 84(3), 271-280. doi:10.1016/0304-8853(90)90105-Y.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D523-F

Abstract

This paper is intended to demonstrate the usefulness of controlled alloying for the understanding of heavy-fermion physics: (1) Th-substitution for Ce in CeCu2Si2 emphasizes the dominating role of the dopant-induced strain fields in generating incoherent scattering and pair breaking, (2) replacement of Cu by Ni in Ce(Cu1-xNix)2Ge2 leads to phenomena which are interpreted as derived from a transition between local-moment and itinerant heavy-fermion magnetism, and (3) increasing Cu concentration in UCu4+xAl8-x is accompanied by an antiferromagnetic to nonmagnetic transition near xcr = 1.5 similar to what has been found before for several Ce-based systems. A heavy Fermi-liquid phase with incipient coherence of the quasiparticles is established for x⪆xcr.