Magnetism in the triangular lattice materials CeCl<sub>3</sub> and CeBr<sub>3</sub>
ORAL
Abstract
There is currently great interest in systems with J = 1/2 ground state and Ising-like interactions that may be geometrically frustrated, as in the triangular lattice, or frustrated by competing interactions, like the honeycomb Kitaev model. This interest has spurred our investigation of the triangular lattice rare earth materials CeCl3 and CeBr3, where the Ce3+ ion is expected to have an effective J = 1/2 ground state. Some magnetic properties of these materials were studied many years ago but prior to this investigation there had been no direct measurements of the magnetic order or excitations using neutron scattering. Here we report neutron scattering investigations of crystal field excitations in CeBr3, confirming the J=1/2 ground state, and neutron diffraction measurements of the magnetic order in CeCl3, showing that the system orders antiferromagnetically at low temperature with an ordering wave-vector (1/3 1/3 1/2).
*This material is based upon work supported by the National Science Foundation under Grant No 1808964.This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory.
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Presenters
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Matthew A Cothrine
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37916, USA
- University of Tennessee