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Multiple field-induced phases in the frustrated triangular magnet Cs3Fe2Br9

Brüning, D.; Fröhlich, T.; Gorkov, D.; Cisarova, I.; Scurschii, I.; Rossi, L.; Bryant, B.; Wiedmann, S.; Meven, M.; Ushakov, A.; Streltsov, S. V.; Khomskii, D.; Becker, P.; Bohatý, L.; Braden, M.; Lorenz, T.

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 ǀǀ 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.

Permalink: https://www.hzdr.de/publications/Publ-33147
Publ.-Id: 33147