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  1. ; ; ; ; ; ; ; ( , Journal of Physics: Condensed Matter)
    Abstract

    We report the results of thermodynamic measurements in external magnetic field of the cubic Ce-based cage compounds CeT2Cd20(T= Ni,Pd). Our analysis of the heat-capacity data shows that the Γ7doublet is the ground state multiplet of the Ce3+ions. Consequently, for the Γ7doublet it can be theoretically shown that the Ruderman–Kittel–Kasuya–Yosida interaction between the localized Ce moments mediated by the conduction electrons, must vanish at temperatures much lower than the energy separating the ground state doublet from the first excited Γ8quartet. Our findings provide an insight as to why no long range order has been observed in these compounds down to temperatures in the milliKelvin range.

     
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  2. ; ; ; ; ; ; ; ( , Physical Review B)
  3. ; ; ; ; ; ; ( , Physical Review B)
  4. ; ; ; ; ; ; ; ; ( , Journal of Physics: Condensed Matter)