Determination of the crystal field levels in TmV2Al20

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Australian Institute of Physics
The interest in compounds of the RM2Al20-type (R = lanthanide, M = transition metal) in recent years reflects the fascinating physical and magnetic properties on display at low temperatures. For example, in PrV2Al20 and PrTi2Al20 the phenomena reported include a quadrupolar Kondo effect [1] and superconductivity [2]. Central to such systems is 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 in the hope of observing similar phenomena at low temperatures. At last year’s ‘Wagga’ we reported that we had determined the Tm3+ crystal field parameters W = 0.42(1) and x = -0.63(1) [3] (based on the Lea, Leask and Wolf formalism [4]) for TmV2Al20 using inelastic neutron scattering on PELICAN at the OPAL reactor, Lucas Heights. However, the line shapes found were extremely broad Lorentzians, indicative of a coupling of crystal field states to conduction electrons, ‘smearing out’ the energy required for transitions. Here, we report more recent developments: Tm3+ electron spin resonance results together with modelling of physical properties lead to the conclusion that there is a small local distortion away from cubic symmetry.
Crystals, Thulium, Vanadium, Rare earth, Magnetic properties, Temperature range 0065-0273 K, Crystal field, Inelastic scattering, Measuring instruments, Spin, Symmetry
Hutchinson, W. D., White, R., Stewart, G. A., Iles, G. N., Mole, R. A., Cadogan, J. M., Namiki, T., & Nishimura, K. (2018). Determination of the crystal field levels in TmV2Al20. Poster presented to the 42nd Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 30th January – 2nd February, 2018, (pp. 78). Retrieved from: