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Publications in Scientific Journals:

M. Loewenhaupt, E. Faulhaber, A. Schneidewind, M. Deppe, K. Hradil:
"Crystal field excitations in CeCu2Ge2: Revisited employing a single crystal and inelastic neutron scattering";
Journal of Applied Physics, 111 (2012), 7; 07E124-1 - 07E124-3.



English abstract:
The intermetallic compound, CeCu2Ge2, is the counterpart of the heavy-fermion superconductor CeCu2Si2. CeCu2Ge2 is a magnetically ordering (TN = 4.1K) Kondo lattice with a moderate Sommerfeld coefficient of 140 mJ/ molK2. Earlier inelastic neutron measurements on a polycrystalline sample revealed a doublet ground state and a quasi-quartet excited state at 16.5 meV, although a splitting of the 4f1 (J = 5/2) ground state multiplet into 3 doublets is expected from the point symmetry of the Ce3+ ions. We performed detailed inelastic neutron scattering experiments on a single crystal at the thermal triple-axis spectrometer PUMA at FRM II for different crystallographic directions. From our results we infer that the quasi-quartet, in fact, consists of two doublets at 17.0 and 18.3 meV which exhibit a strong directional dependence of their transition matrix elements to the ground state doublet. Finally, we will present a new set of crystal field parameters.

Keywords:
crystal field; heavy fermion material; inelastic neutron scattering


"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1063/1.3673816


Created from the Publication Database of the Vienna University of Technology.