Publication date: 21st July 2025
Cs₂CoBr₄ is a wide band gap material of interest in the field of quantum magnetism and frustrated systems. We report here the synthesis of Cs₂CoBr₄ nanocrystals. Cs₂CoBr₄ has an orthorhombic crystal structure, with disconnected [CoBr₄]²⁻ tetrahedra (due to these isolated units referred to as 0D structure). They are charge balanced by Cs⁺ cations, which fill the voids between the tetrahedra. In recent years, significant progress has been made in the development of similar low-dimensional perovskite-related materials. Notably, in the pursuit of lower toxicity, researchers have synthesized and studied various nanocrystals of low-dimensional transition metal halides [1] but have not yet reported Cs₂CoBr₄. In bulk this phase exhibits a triangular-lattice antiferromagnetic behavior, and at 1.3 K < T < 6 K a spin-liquid regime can be observed due to spatial anisotropy and geometric frustration [2]. The EPR studies showing this were performed in the bulk phase only. Due to finite size effects, magnetic nanoparticles are found to exhibit considerably different magnetic properties than those found in their corresponding bulk materials.
To address these challenges, we have demonstrated a new colloidal synthetic strategy to obtain pure-phase Cs₂CoBr₄, which was prepared through the colloidal hot injection method, where anion precursors were co-injected into the mixture of metal complexes at the desired temperature. [3]
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