Evidence for 4f-ligand dehybridization in the evolution of heavy-fermion behavior in the series CeCu2xNixSi2

E. V. Sampathkumaran and R. Vijayaraghavan
Phys. Rev. Lett. 56, 2861 – Published 30 June 1986
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Abstract

Evolution of heavy-fermion behavior in CeCu2Si2 from strong mixed valence in CeNi2Si2 is demonstrated in the CeCu2xNixSi2 system. Heavy-fermion behavior, as probed by the low-temperature susceptibility, χ(O), is destroyed at xapeq20.65. There is an anomalous increase in the Ce-ligand distances, whithout any anomaly in the Ce-Ce separation, for x<0.65, tracking the x dependence of χ(O). This observation shows explicitly for the first time that the tendency for dehybridization of the ligand valence orbitals with the Ce 4f orbital is essential to attain the heavy-fermion ground state.

  • Received 26 February 1986

DOI:https://doi.org/10.1103/PhysRevLett.56.2861

©1986 American Physical Society

Authors & Affiliations

E. V. Sampathkumaran and R. Vijayaraghavan

  • Tata Institute of Fundamental Research, Bombay 400 005, India

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Vol. 56, Iss. 26 — 30 June 1986

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