Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce1-xLax)Cu5In

M. B. Tchoula Tchokonté, P. De V Du Plessis, A. M. Strydom, D. Kaczorowski, A. Czopnik, Z. Kletowski

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6 Citations (Scopus)


The influence of substituting Ce with La in the Kondo compound CeCu5In has been investigated using x-ray diffraction, specific heat (Cp), electrical resistivity (ρ(T)), magnetoresistivity (MR) and thermoelectric power (TEP) measurements. Cp of CeCu5In and the (Ce1-xLax)Cu5In alloys shows enhanced values at low temperatures. Between 10 and 20 K the equation Cp/T = γconv + βT2 fits the data for all alloys with γconv scaling linearly with Ce concentration. Below 10 K a pronounced upturn in Cp values occurs. Susceptibility data above 100 K follow the Curie-Weiss relation and give effective moment μeff values in fair agreement with that of a Ce3+-ion. The ρ(T) studies illustrate the evolution from Kondo lattice to single-ion Kondo behaviour with increase in La content in the (Ce1-xLax)Cu5In alloy series. MR measurements on Ce dilute alloys are interpreted within the single-ion Bethe ansatz description and values of the Kondo temperature TK are calculated. A compressible Kondo lattice model has been used to describe the decrease in TK and in Tmρ (the temperature at which a maximum in ρ(T) occurs for the coherent dense Kondo alloys) with decrease in Ce concentration for these alloys. The TEP is positive and shows a maximum at approximately 45 K for several investigated (Ce1-xLax)Cu5In alloys.

Original languageEnglish
Pages (from-to)1981-1994
Number of pages14
JournalJournal of Physics Condensed Matter
Issue number12
Publication statusPublished - 31 Mar 2004

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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