| Résumé | Interest in the spin-1/2 hexagonal perovskites, typified by CsCoCl₃ and including RbCoCl₃, has persisted over several decades due to their unusual Ising-chain-like antiferromagnetic ordering. Despite considerable theoretical and experimental work, evidence of the origin of the magnetic excitations of these materials has been limited by an incomplete knowledge of their magnetic ordering and exchange interactions. Now, with the availability of detailed measurements of such information obtained by neutron scattering [M. Mena et al., Phys. Rev. Lett. 124, 257201 (2020)], we are motivated to report a study for RbCoCl₃. We employ the concept of a Zeeman ladder of magnetic excitations below the antiferromagnetic transition temperature at 28 K, as well as showing the existence of a bound magnetic state, to accurately predict the energies of five magnetic excitations observed by Raman scattering. Such a remarkable match of theory to experiment with just one adjustable parameter augers well for theoretical applications in other such perovskites. |
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