A polarised neutron study of crystal field transitions in CeCu6

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Australian Institute of Physics
CeCu6 is a heavy Fermion compound in which the Ce magnetic moment is suppressed by the Kondo effect resulting from the admixture of the local 4f electrons with the conduction electrons. Crystal field transitions between the low-lying states of the Ce ion have been observed using inelastic neutron scattering [1–3]. The transitions were contaminated by phonon scattering which can be corrected using a complex scaling function using a complementary spectrum of LaCu6. Neutron time of flight spectroscopy with neutron polarisation analysis permits the in situ separation of magnetic and lattice vibrational energy spectra. Preliminary experiments on LONGPOL allow an indicative separation of a broadened crystal field transition and features due to lattice vibrations [4]. The preliminary analysis indicated an inelastic spin-flip feature at -12 meV which is due to the crystal field while an inelastic non-spin-flip feature at -6 meV is predominantly due to phonon scattering. A more complete polarisation analysis study has been performed using a magnetic coil to switch the polarisation at the sample position between perpendicular and parallel to the scattering vector. These results and their interpretation are reported here.
Fermions, Kondo effect, Antiferromagnetic materials, Electrons, Thermal conduction, Crystal field, Inelastic scattering, Lattice vibrations, Spectra, Spin flip, Magnet coils
Harker, S. J., Hicks, T. J., Goossens, D. J., Mulders, A. M., Fied, Y., Yu. D., & Kennedy, S. J. (2004). A polarised neutron study of crystal field transitions in CeCu6. Poster presented to the 28th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, 3-6 February 2004. Retrieved from: https://www.physics.org.au/wp-content/uploads/cmm/2004/04handbook.pdf