Magnetically frustrated dynamics on the Cairo pentagonal lattice
We have synthesized a large high quality 2.35 g single crystal of Bi2Fe4O9, a quasi two-dimensional Cairo pentagonal lattice, a new motif in geometrical frustration. Previous studies on a smaller sample (0.6 g), by another group, found spin waves in the energy range 5- 25 meV with a gap detected up to 5 meV. Two of the spins in the pentagon couple strongly (28 meV) and the others less strong (3-6 meV), with all couplings found to be AFM. We have independently investigated the low-energy spin wave excitations at 10 K with high energy resolution in the energy range, 0-9 meV using CAMEA at PSI, and have uncovered inconsistencies with previous work. For instance, our data show a clear double spin gap. In this proposal we wish to extend our inelastic neutron scattering studies to access medium energy spin waves. IN20 is ideally suited to probe the subtle effects found in this compound.
The data is currently only available to download if you are a member of the proposal team.
The recommended format for citing this dataset in a research publication is in the following format:
HANSEN Ursula Bengaard; DEEN Pascale Petronella; KIRSCH Andrea; Jakob Lass; LEFMANN Kim and YNILL LENANDER Emma. (2023). Magnetically frustrated dynamics on the Cairo pentagonal lattice. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.TEST-3263
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This data is not yet public
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