Magnetic phase diagram and spin Hamiltonian of antiferromagnet Cs${}_2$CoI${}_4$

Abstract

We report comprehensive thermodynamic and neutron scattering measurements on the $S$ = 3/2 antiferromagnet Cs${}_2$CoI${}_4$, a member of the thoroughly studied family of frustrated magnets Cs${}_{2}M{X}_4$ ($M$ = Cu, Co, Ru, $X$ = Br, Cl, I, O). Unlike previously studied members, Cs${}_2$CoI${}_4$ 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.

15 pages, 17 figures

References in corpus (9)

• Commissioning of the novel Continuous Angle Multi-Energy Analysis Spectrometer at the Paul Scherrer Institut
• MJOLNIR: A Software Package for Multiplexing Neutron Spectrometers
• Spin Density Wave versus Fractional Magnetization Plateau in a Triangular Antiferromagnet
• Low-temperature ordered phases of the spin-$\frac{1}{2}$ XXZ chain system Cs${}_2$CoCl${}_4$
• Magnetic phase diagram of the breathing-kagome antiferromagnet Nd${}_3$BWO${}_9$
• Confinement of fractional excitations in a triangular lattice antiferromagnet
• A new inelastic neutron spectrometer HODACA
• New applications for the world's smallest high-precision capacitance dilatometer and its stress-implementing counterpart
• Spin-flop-like transition as quantum critical point in Cs${}_2$RuO${}_4$