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 Na${}_2$Co${}_2$TeO${}_6$, BaCo${}_2$(AsO${}_4$)${}_2$, Na${}_2$BaCo(PO${}_4$)${}_2$, and CoX${}_2$ (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 $j_{\mathrm{eff}}=1/2$ 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.

11 pages, 7 figures

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• Hydrostatic pressure effect on Co-based honeycomb magnet BaCo2(AsO4)2

Cited by in corpus (6)

• BaCo${}_2$(AsO${}_4$)${}_2$: Strong Kitaev, After All
• From continuum excitations to sharp magnons via transverse magnetic field in the spin-1/2 Ising-like triangular lattice antiferromagnet Na2BaCo(PO4)2
• Emergent Spin Supersolids in Frustrated Quantum Materials
• Bond-dependent interactions and ill-ordered state in the honeycomb cobaltate BaCo${}_2$(AsO${}_4$)${}_2$
• Field-induced magnetic phases in the Kitaev candidate Na${}_3$Co${}_2$SbO${}_6$
• Trigonal distortion in the Kitaev candidate honeycomb magnet BaCo2(AsO4)2