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Substitution of nickel by copper in the heavy fermion systemCeNi$_{9-x}$Cu$_x$Ge$_4$ alters the local crystal field environment of theCe$^{3+}$-ions. This leads to a quantum phase transition near $x\approx0.4$,which is not only driven by the competition between Kondo effect and RKKYinteraction, but also by a reduction of an effectively fourfold to a twofolddegenerate crystal field ground state. To study the consequences of a changingcrystal field in CeNi$_8$CuGe$_4$ on its Kondo properties, inelastic neutronscattering (INS) experiments were performed. Two well-defined crystal fieldtransitions were observed in the energy-loss spectra at 4 K. The crystal fieldlevel scheme determined by neutron spectroscopy is compared with results fromspecific heat measurements.

Crystal field studies on the heavy fermion compound CeNi$_8$CuGe$_4$