Insulators containing chains of magnetic transition metal cations provide platforms for probing spin-12 dynamics and quantum critical behavior. Li₂CoCl₄ contains edge-sharing CoCl₆ octahedra that form chains along the crystallographic c axis and orders antiferromagnetically at zero field, but questions remain about its applied-field magnetic structure and the Co^2+ spin state. Here, we show with neutron diffraction on a polycrystalline sample how the antialigned chains of cobalt moments begin to transition to a ferromagnetic state above 1. 6 T. Further, using magnetic resonance absorption measurements and noninteracting spin models, we reveal the strongly anisotropic nature of the Co^2+ ion's XY-like magnetic behavior (g_=2. 77 and g_=5. 23) and its J=12 ground state. We therefore supply the magnetic structures and anisotropic description needed to explore the dynamics of the field-driven magnetic phases, laying the foundation for further experimental and theoretical studies.
Riedel et al. (Tue,) studied this question.
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