Dilution and non-Fermi-liquid effects in the CePtIn Kondo lattice

F. C. Ragel, P. De V.Du Plessis, A. M. Strydom

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17 Citations (Scopus)

Abstract

Measurements of electrical resistivity (ρ(T)), magnetoresistivity (MR), magnetic susceptibility (χ(T)) and heat capacity (CP(T)) are presented for the (Ce1-xLax)PtIn alloy system of which the CePtIn parent is a known dense Kondo compound that does not order magnetically down to 50mK. χ(T) for alloys 0≤x≤0.8 exhibits Curie-Weiss behaviour. ρ(T) results indicate a transition from a dense Kondo behaviour for 0≤x≤0.2 to a single-ion Kondo region (0.3≤x≤0.8). The Kondo energy scale as given by TK values calculated from MR studies and by the temperature Tmaxρ(mag) where the magnetic contribution to ρ(T) exhibits a maximum value, is compared with theoretical models. It is shown that the experimental results not only depend on a volume effect as given by the compressible Kondo lattice model of Lavagna but in addition confirm the more complex behaviour recently presented by Burdin and Fulde for a Kondo alloy system in which the magnetic (Ce) and non-magnetic (La) atoms are distributed randomly. Non-Fermi-liquid behaviour is predicted by Burdin and Fulde at certain critical concentrations of the alloy system and experimental evidence for this is presented through χ(T), ρ(T) and CP(T) measurements.

Original languageEnglish
Article number046008
JournalJournal of Physics Condensed Matter
Volume21
Issue number4
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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