Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Correlated Electrons: Poster
TT 37.18: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P4
Magnetism in i-Tb-Cd Quasicrystals — •Andreas Kreyssig1, 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. Orth2, 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.
[1] P. Das, A. Kreyssig et al., Phys. Rev. B 108, 134421 (2023).
Keywords: Quasicrystals; Magnetic correlations; Frustration; Neutron scattering