Abstract
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 language | English (US) |
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Pages (from-to) | 4157-4163 |
Number of pages | 7 |
Journal | Chemistry of Materials |
Volume | 36 |
Issue number | 9 |
DOIs | |
State | Published - May 14 2024 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Chemical Engineering
- Materials Chemistry