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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.29: Poster

Dienstag, 18. März 2025, 10:00–12:30, P1

Magnetism in i-Tb-Cd quasicrystals — •Andreas Kreyssig — Institute for Experimental Physics 4, Ruhr-Universität Bochum, 44801 Bochum, Germany

i-Tb-Cd orders as icoshedral quasicrystal with the magnetic Tb3+ ions arranged in Tsai-type clusters. We studied the magnetic correlations and excitations by elastic and inelastic neutron scattering on single-grain isotopically enriched samples. The measurements of the crystalline electric field excitations demonstrated that the Tb3+ moments are directed along the local fivefold axes of the Tsai-type clusters. By using a simple Ising-type model for the moment configurations on a single Tb3+ icosahedron, we calculated the magnetic diffuse scattering for the low-energy configurations and identified the most likely moment configuration in a single cluster by comparison with our diffuse neutron scattering signals. We further studied the role of intercluster interactions for magnetic frustration and the magnetic scattering.

This work was supported by the U. S. DOE, BES, DMSE, under Contract DE-AC02-07CH11358. This research used resources at HFIR and SNS, U. S. DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory.

Keywords: Quasicrystals; Magnetic correlations; Frustration; Neutron scattering