Abstract
Low temperature specific heat, magnetic susceptibility andL III-XAS measurements on Ce24Co11 are reported. The electronic specific heat can be decomposed into two contributions: a low temperature one (arising atT<5 K), with a maximum of 2.2 J/Kmole at 0.9 K, and another one becoming dominant atT>5 K, characterized by a γHT = 1.8 J/K2 mole coefficient. The χ·T product changes continuously with temperature, from 0.48 emu K/mole at 2 K to 7.85 emu K/mole at 200 K. TheL III-mean valence is ν=3.15.
As the 24 Ce atoms are distributed in ten unequivalent crystalline sites, we interpret the experimental results as due to: one atom which behaves as a Heavy Fermion and the rest as Kondo and Intermediate Valent, with a distribution of characteristic energies governed by nine different environments. Qualitatively, the specific heat behaviour under applied field and the ν=3.15 value are in agreement with this interpretation.
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Kappler, J.P., Schmerber, G., Trovarelli, O. et al. Coexistence of heavy fermion and intermediate valence behaviour in Ce24Co11 . Z. Physik B - Condensed Matter 86, 253–256 (1992). https://doi.org/10.1007/BF01313833
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DOI: https://doi.org/10.1007/BF01313833