Determination of the crystal field levels in TmV2Al20

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Australian Institute of Physics
Recent interest in so called caged rare earth compounds of the RM2Al20-type (R = lanthanide, M = transition metal) follow from their fascinating physical and magnetic properties at low temperatures. Recent work on PrV2Al20 and PrTi2Al20 revealed unusual phenomena, including a quadrupolar Kondo effect and superconductivity, brought about by the cubic symmetry of the Pr3+ site inducing a non-magnetic ground state in the ion. As a hole analogue of the PrV2Al20 compound, TmV2Al20 has been investigated for equivalent heavy Fermion behaviour at low temperatures. In previous work, specific heat and magnetisation data were modelled with the crystal field parameters W = 0.5 K and x = -0.6 based on the Lea, Leask and Wolf formalism. However, the experimental zero field specific heat near 0.5 K could only be matched in the modelled curves using an artificial ground state broadening. In this work inelastic neutron scattering data obtained from the PELICAN time of flight spectrometer located at the OPAL reactor, Lucas Heights has allowed further refinement of the values to W = 0.42(1) K and x = -0.63(1). In addition the CEF transitions are found to be very broad, as required for the specific heat, and suggestive of strong 4f-conduction electron coupling.
Alloys, Enriched uranium reactors, Experimental reactors, Irradiation reactors, Isotope production reactors, Measuring instruments, Physical properties, Pool type reactors, Rare earth alloys, Reactors, Research and test reactors, Scattering, Spectrometers
White, R., Hutchison, W. D., Iles, G. N., Mole, R. A., Cadogan, J. M., Namiki, T., & Nishimura, K. (2017). Determination of the crystal field levels in TmV2Al20. Poster presented to the 41st Annual Condensed Matter and Materials Meeting, 31st January - 3rd February 2017 Charles Sturt University Wagga Wagga, NSW, Australia. (pp.50). Retrieved from: