Journal Article

FZJ-2021-05250

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Multiple field-induced phases in the frustrated triangular magnet Cs$_3$Fe$_2$B$_ 9$

Brüning, D. (Corresponding author) ; Fröhlich, T. ; Gorkov, D. ; Císařová, I. ; Skourski, Y. ; Rossi, L. ; Bryant, B. ; Wiedmann, S. ; Meven, M.FZJ*RWTH* ; Ushakov, A. ; Streltsov, S. V. ; Khomskii, D. ; Becker, P. ; Bohatý, L. ; Braden, M. ; Lorenz, T.

2021
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/29573  doi:10.1103/PhysRevB.104.064418

Abstract: 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.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd) ; Crystallography (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)
3. JARA-FIT (JARA-FIT)
4. Streumethoden (JCNS-2)
5. Energiesystem: Integration (PTJ-ESI)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)

Experiment(s):

1. HEiDi: Single crystal diffractometer on hot source (SR9b)
2. KOMPASS: Cold three axes spectrometer with polarization analysis (NL1)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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