Comparative Raman Scattering Study of Crystal Field Excitations in Co-based Quantum Magnets
Abstract
Co-based materials have recently been explored due to potential to realise complex bond-dependent anisotropic magnetism. Prominent examples include Na2Co2TeO6, BaCo2(AsO4)2, Na2BaCo(PO4)2, and CoX2 (X = Cl, Br, I). In order to provide insight into the magnetic interactions in these compounds, we make a comparative analysis of their local crystal electric field excitations spectra via Raman scattering measurements. Combining these measurements with theoretical analysis confirms the validity of j eff = 1/2 single-ion ground states for all compounds, and provides accurate experimental estimates of the local crystal distortions, which play a prominent role in the magnetic couplings between spin-orbital coupled Co moments.
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