The quartet ground state in CeB$_6$: an inelastic x-ray scattering study
M. Sundermann, K. Chen, H. Yava\c{s}, Han-Oh Lee, Z. Fisk, M. W., Haverkort, L. H. Tjeng, A.Severing
TL;DR
This study uses non-resonant inelastic x-ray scattering to confirm that CeB$_6$ has a localized $b3_8$ quartet ground state, enhancing understanding of its hidden order properties.
Contribution
It introduces a new application of NIXS to determine the ground state symmetry in CeB$_6$, confirming the localized crystal-field model with a $b3_8$ quartet ground state.
Findings
Ground state is a $b3_8$ quartet
NIXS effectively probes higher-order transitions
Supports localized crystal-field model
Abstract
We investigated the ground state symmetry of the cubic hidden order compound CeB by means of core level non-resonant inelastic x-ray scattering (NIXS). The information is obtained from the directional dependence of the scattering function that arises from higher than dipole transitions. Our new method confirms that the ground state is well described using a localized crystal-field model assuming a quartet ground state.
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