Magnetic phase diagram and spin Hamiltonian of antiferromagnet Cs 2 CoI 4

Physical Review Materials 2026 Open access

Read full text
Authors: S. D. Nabi, L. Facheris, V. Romerio, V. Kocsis, K. Yu. Povarov, D. Sheptyakov, J. Lass, D. G. Mazzone, H. Kikuchi, T. Masuda, S. A. Barnett, D. R. Allan
+3 more Z. Yan, S. Gvasaliya, A. Zheludev
DOI: 10.1103/4ysh-jn8d
Cited by: 1
References: 35

Abstract

We report comprehensive thermodynamic and neutron scattering measurements on the 𝑆=3/2 antiferromagnet Cs2⁢CoI4, a member of the thoroughly studied family of frustrated magnets Cs2⁢𝑀⁢𝑋4 (𝑀=Cu, Co, Ru, 𝑋=Br, Cl, I, O). Unlike previously studied members, Cs2⁢CoI4 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.

Fields of Study & Subjects

Inorganic Chemistry and Materials Advanced Condensed Matter Physics Iron-based superconductors research

Publication details

Journal / source
Physical Review Materials
Publisher
American Physical Society (APS)
Volume
10
Issue
5
Publication date
29 May 2026
Language
EN