Frustrated Magnetism in a Potential Quantum Material Based on Spin-1/2 Co2+ Dimers

Xianghan Xu, Tong Chen, Haozhe Wang, Weiwei Xie, C. L. Broholm, Robert J. Cava

Research output: Contribution to journalArticlepeer-review


The layered-triangular-based compound Rb2Co2(SeO3)3 was designed and synthesized to investigate frustrated magnetism in a Co2+-based system. The crystal structure consists of a planar triangular array of face-sharing Co2+O6 octahedra forming dimers separated by Rb+ layers. Comparison of Rb2Co2(SeO3)3 to the isostructural known compound K2Co2(SeO3)3 suggests that the larger-size Rb+ spacers weaken its interlayer interactions. The magnetic entropy reveals the effective S = 1/2 nature of Co2+ at low temperatures in this compound. A feature at around 3.4 K appears in both the magnetic data and heat capacity data in zero field, which can be sensitively tuned by applying an out-of-plane magnetic field, and it shows a substantially reduced heat capacity change than expected for a 3D magnetic ordering, suggesting competing magnetic interactions and a frustrated nature. Successive magnetization plateaus observed at low temperature indicate the rich quantum magnetism that results from replacing spins with spin dimers on the triangular lattice.

Original languageEnglish (US)
Pages (from-to)4157-4163
Number of pages7
JournalChemistry of Materials
Issue number9
StatePublished - May 14 2024

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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