Magnetic phase diagram and spin Hamiltonian of antiferromagnet Cs2CoI4
Abstract
We report comprehensive thermodynamic and neutron scattering measurements on the S = 3/2 antiferromagnet Cs2CoI4, a member of the thoroughly studied family of frustrated magnets Cs2MX4 (M = Cu, Co, Ru, X = Br, Cl, I, O). Unlike previously studied members, Cs2CoI4 undergoes a structural phase transition, for which we determine the low-temperature crystallographic structure. The resulting symmetry reduction strongly affects both the magnetic exchange interactions and single-ion anisotropy. Despite the large parameter space, we propose a minimal magnetic Hamiltonian that reasonably captures the observed excitation spectrum, analyzed using extended SU(4) linear spin-wave theory.
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