Crystal filed excitations of a honeycomb Kondo lattice CePt6Al3 with Pd-doping and reference compound NdPt6Al3
Recently the honeycomb lattice has attracted considerable attraction due to the bond dependent exchange interactions according to the Kitaev model, resulting in a quantum spin-liquid ground state. We have synthesised a new Ce-based honeycomb lattice compound CePt6Al3, which exhibits heavy Fermion behaviour and long-range magnetic ordering at 0.75 K as evident from a peak in the ac-susceptibility and heat capacity. The magnetic entropy indicates a doublet ground state and a quasi-quartet excited state under the crystal electric field (CEF). Our inelastic neutron scattering study of CePt6Al3 reveals a CEF excitation near 15 meV at 5 K that exhibits unusual temperature dependence, the peak goes down to 10 meV at 170 K. Considering the honeycomb lattice of CePt6Al3, one would expect a presence of unconventional magnetic excitations. We therefore propose to investigate the CEF excitations in Ce(Pt1-x)6Al3 (x=0.1 and 0.2), which exhibit magnetic ordering at around 3 K and the magnetic reference NdPt6Al3, which exhibits magnetic ordering at 1.25 K, using PANTHER to understand the unusual temperature dependence of the CEF excitations in CePt6Al3.
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D.T. Adroja and KOZA Michael Marek. (2021). Crystal filed excitations of a honeycomb Kondo lattice CePt6Al3 with Pd-doping and reference compound NdPt6Al3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-04-512
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