Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.30: Poster

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

Magnetism in i-Tb-Cd quasicrystals — •Andreas Kreyssig^{1, 2}, P. Das², G. S. Tucker², A. Podlesnyak³, Feng Ye³, Masaaki Matsuda³, T. Kong², S. L. Bud’ko², P. C. Canfield², R Flint², P. P. Orth^{2, 4}, T. Yamada⁵, and A. I. Goldman² — ¹Experimental Physics IV, Ruhr University Bochum, Bochum, Germany — ²Ames Laboratory, U.S. DOE, and Department of Physics and Astronomy, Iowa State University, Ames, USA — ³Neutron Scattering Division, Oak Ridge National Laboratory, USA — ⁴Department of Physics, Harvard University, Cambridge, USA — ⁵Department of Applied Physics, Tokyo University of Science, Tokyo, Japan

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. We calculated the magnetic diffuse scattering for the low-energy configurations using an Ising-type model for the moment arrangements on a single Tb³⁺ icosahedron. By comparison with our diffuse neutron scattering signals, we identified the most likely moment configuration in a single cluster. 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, Contract DE-AC02-07CH11358, and resources at HFIR and SNS, U. S. DOE.

P. Das, A. Kreyssig, et. al., Phys. Rev. B 108, 134421 (2023).

Keywords: Quasicrystals; Magnetic correlations; Frustration; Neutron scattering