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Magnetic Copper Selenite-Sulfate Cu3O2(HSeO3)(HSO4)(H2O) with T26-Type Non-Archimedean Lattice Featuring a Robust
Nian Shi1, Yanhong Wang1,2, Hui Li1
1Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Materials Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan 430074, China.
None:
Discovering novel magnetic materials with unique spin-lattices for exotic quantum phenomena is a significant challenge. Here, we successfully synthesized a new antiferromagnet, Cu3O2(HSeO3)(HSO4)(H2O), using mixed-anions of trigonal-pyramidal SeO32- and tetrahedral SO42-. Cu3O2(HSeO3)(HSO4)(H2O) consists of corrugated layers forming a rare T26-type non-Archimedean (2-uniform) lattice (Figure 1f), where diamond chains are interconnected through their dimers to form hexagons between spin chains. Despite a large Weiss-temperature θ of -355(1) K, Cu3O2(HSeO3)(HSO4)(H2O) exhibits antiferromagnetic order at 2.3 K, indicating strong quantum spin fluctuations. Interestingly, high-field magnetization measurement shows a robust 1/3-magnetization plateau that remains stable up to 54 T. This phenomenon was not theoretically predicted for regular T26-type non-Archimedean lattices. Notably, Cu3O2(HSeO3)(HSO4)(H2O) represents the first example of all reported non-Archimedean lattices featuring a robust 1/3-magnetization plateau. Our DFT calculation results reveal that the robust 1/3-magnetization plateau arises from the fact that the distorted T26-type non-Archimedean lattice of Cu3O2(HSeO3)(HSO4)(H2O) can be further simplified as a trimer with strong intratrimer interaction of -500 K, requiring a much higher magnetic field to overcome for full saturation. Our work demonstrates that utilizing mixed anions as bridging pathways to regulate magnetic couplings is a promising approach for discovering novel spin lattices with quantum phenomena.
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