A study of Ni-substitution effects on heavy-fermion CeCu 2Si 2-Similarities between Ni substitution and high-pressure effects

Yoichi Ikeda, Shingo Araki, Tatsuo C. Kobayashi, Yusei Shimizu, Tatsuya Yanagisawa, Hiroshi Amitsuka

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6 Citations (Scopus)

Abstract

The effects of Ni substitution on Ce(Cu 1-xNi x) 2Si 2 have been studied by specific heat and electrical resistivity measurements. The specific heat measurement has revealed that the enhanced quantum fluctuations around an antiferromagnetic quantum critical point are markedly suppressed by Ni substitution, and that the Fermi liquid state recovers in the Ni-rich region (x ≥ 0:12). The characteristic T-linear dependence of the resistivity has been observed at approximately x ̃ 0:10 together with a sign of superconductivity. The variation of n in the form of ρ - ρ0 = aT n against T max 1 , at which the resistivity peaks, coincides with the case of high-pressure experiments on pure CeCu 2Si 2. The anomalous T-linear behavior appears to occur in the crossover region from the Kondo regime to the valence fluctuation regime rather than in the conventional antiferromagnetic quantum critical region.

Original languageEnglish
Article number083701
Journaljournal of the physical society of japan
Volume81
Issue number8
DOIs
Publication statusPublished - Aug 1 2012

Keywords

  • CeCu Si
  • Heavy fermion
  • Ni substitution
  • T-linear resistivity
  • Valence fluctuation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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