%0 Journal Article
%A Brüning, D.
%A Fröhlich, T.
%A Gorkov, D.
%A Císařová, I.
%A Skourski, Y.
%A Rossi, L.
%A Bryant, B.
%A Wiedmann, S.
%A Meven, M.
%A Ushakov, A.
%A Streltsov, S. V.
%A Khomskii, D.
%A Becker, P.
%A Bohatý, L.
%A Braden, M.
%A Lorenz, T.
%T Multiple field-induced phases in the frustrated triangular magnet Cs$_3$Fe$_2$B$_ 9$
%J Physical review / B
%V 104
%N 6
%@ 1098-0121
%C Woodbury, NY
%I Inst.
%M FZJ-2021-05250
%P 064418
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000684127200007
%R 10.1103/PhysRevB.104.064418
%U https://juser.fz-juelich.de/record/903596