Can competition between crystal field and Kondo effect cause non-Fermi liquid like behavior?

Abstract

The recently reported unusual behavior of the static and dynamical magnetic susceptibility as well as the specific heat in Ce${}_{1-x}$La${}_x$Ni${}_9$Ge${}_4$ has raised the question of a possible non-Fermi liquid ground state in this material. We argue that for a consistent physical picture the crystal field splitting of two low lying magnetic doublets of the Ce $4f$-shell must be taken into account. Furthermore, we show that for a splitting of the order of the low temperature scale $T^{\ast }$ of the system a crossover behavior between an SU(4) and an SU(2) Kondo effect is found. The screening of the two doublets occurs on different temperature scales leading to a different behavior of the magnetic susceptibility and the specific heat at low temperatures. The experimentally accessible temperature regime down to 50mK still lies in the extended crossover regime into a strong coupling Fermi-liquid fixed point.

4 pages, 4 figures, revtex4

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