Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.37: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Magnetic Interaction in the Frustrated Dimer Magnet Cs3Fe2Br9 — •Felix Wirth1, Sebastian Biesenkamp1, Alexandre Bertin1, Dimitry Gorkov1, Ivan Sidis2, Jakob Lass3, Rafal Wawrzynczak3, Petra Becker-Bohatý4, Ladislav Bohatý4, and Markus Braden1 — 1II. Physic. Inst., Univ. Cologne, Germany — 2LLB, CEA Saclay, France — 3SINQ, PSI Villigen, Switzerland — 4Inst. Geology a. Mineralogie, Univ. Cologne, Germany
The frustrated magnet Cs3Fe2Br9 with Fe2Br9 bioctahedron dimers in a triangular lattice exhibits a remarkable variety of magnetic phases, when magnetic fields are applied along the c-axis and huge magnetoeleastic anomalies [1]. In addition, there are magnetization plateaus for H||c, while magnetization for H||a,b stays linear up to saturation [1]. Here we present additional neutron scattering experiments to further elucidate the character of magnetic correlations. While at low temperature and zero field, magnetic order is commensurate with parallel moments in a dimer, a competing phase is incommensurate. Inelastic neutron scattering studies on the multiplexing spectrometer CAMEA determined the dispersion of magnons in the ordered phase over a wide range of Q space. The results were analyzed by linear spin-wave calculations with SpinW yielding a rather 3D character of the magnetism. However, low-energy magnon response in the ordered state as well as the diffuse and quasielastic scattering in the intermediate and paramagnetic phases are smeared over large parts on the Brillouin zone boundary, further characterizing this system as a peculiar frustrated magnet. [1] D. Brüning, et al. Phys. Rev. B. 104 (2021).
Keywords: Frustration; Dimer; Magnon; Triangular Lattice; Neutron Scattering