期刊
PHYSICAL REVIEW B
卷 104, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.064418
关键词
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资金
- German Research Foundation [277146847-CRC 1238]
- Bundesministerium fur Bildung und Forschung [05K19PK1]
- Ministry of Science and Higher Education of Russia [AAAA-A18-118020190095-4]
- HFML-RU/NWO-I
- HLDHZDR
The Cs3Fe2Br9 material contains Fe2Br9 bi-octahedra with semiclassical S = 5/2 Fe3+ spins, leading to a rich magnetic phase diagram with different ordered phases. The high degree of magnetic frustration and strong magnetoelastic coupling result in a surprisingly complex magnetic behavior in this material.
The recently discovered material Cs3Fe2Br9 contains Fe2Br9 bi-octahedra forming triangular layers with hexagonal stacking along the c axis. In contrast to isostructural Cr-based compounds, the zero-field ground state is not a nonmagnetic S = 0 singlet-dimer state. Instead, the Fe2Br9 bi-octahedra host semiclassical S = 5/2 Fe3+ spins with a pronounced easy-axis anisotropy along c, and interestingly, the intradimer spins are ordered ferromagnetically. The high degree of magnetic frustration due to (various) competing intradimer and interdimer couplings leads to a surprisingly rich magnetic phase diagram. The zero-field ground state is already reached via an intermediate phase, and the high-field magnetization and thermal expansion data for H parallel to c identify 10 different ordered phases. Among them are phases with constant magnetization of 1/3, respectively 1/2, of the saturation value, and several transitions are strongly hysteretic with pronounced length changes, reflecting strong magnetoelastic coupling.
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