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Magnetic phase diagram and spin Hamiltonian of antiferromagnet Cs2CoI4

S. D. Nabi1,*, L. Facheris1, V. Romerio1, V. Kocsis2, K. Yu. Povarov3, D. Sheptyakov4, J. Lass4, D. G. Mazzone4, H. Kikuchi5,† et al.

T. Masuda5, S. A. Barnett6, D. R. Allan6, Z. Yan1, S. Gvasaliya1, and A. Zheludev1,‡

  • *Contact author: nabid@ethz.ch
  • †Present address: Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • ‡http://www.neutron.ethz.ch/
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Phys. Rev. Materials 10, 054420 – Published 29 May, 2026

DOI: https://doi.org/10.1103/4ysh-jn8d

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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Phys. Rev. Materials 10, 054420– Published 29 May, 2026
  • Received 9 March 2026
  • Accepted 12 May 2026
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