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

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

2009-06-09

arxiv.org/abs/0906.1682v1

Journal of Physics: Conference Series 200 (2010) 012160

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, conference SCES09

Scientific paper

10.1088/1742-6596/200/1/012160

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

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