TY  - JOUR
AU  - Brüning, D.
AU  - Fröhlich, T.
AU  - Gorkov, D.
AU  - Císařová, I.
AU  - Skourski, Y.
AU  - Rossi, L.
AU  - Bryant, B.
AU  - Wiedmann, S.
AU  - Meven, M.
AU  - Ushakov, A.
AU  - Streltsov, S. V.
AU  - Khomskii, D.
AU  - Becker, P.
AU  - Bohatý, L.
AU  - Braden, M.
AU  - Lorenz, T.
TI  - Multiple field-induced phases in the frustrated triangular magnet Cs$_3$Fe$_2$B$_ 9$
JO  - Physical review / B
VL  - 104
IS  - 6
SN  - 1098-0121
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2021-05250
SP  - 064418
PY  - 2021
AB  - The recently discovered material Cs$_3$Fe$_2$Br$_9$ contains Fe$_2$Br$_9$ 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 Fe$_2$Br$_9$ bi-octahedra host semiclassical S=5/2 Fe$^{3+}$ 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∥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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000684127200007
DO  - DOI:10.1103/PhysRevB.104.064418
UR  - https://juser.fz-juelich.de/record/903596
ER  -