Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Frustrated Magnets II
MA 40.2: Vortrag
Donnerstag, 21. März 2024, 15:15–15:30, H 1058
Influence of defects produced by He-ion irradiation on the magnetic properties of the pyrochlore Ho2 Ti2 O7 — •Ena Osmic1,2, Sumanta Chattopadhyay1, Thomas Herrmannsdörfer1, Marc Uhlarz1, Shavkat Akhmadaliev3, Uta Lucchessi3, Stephan Winnerl3, Geetha Balakrishnan4, Stefan Facsko3, Maria Eugenia Toimil-Morales5, and Joachim Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden, HZDR — 2Institut für Festkörper- und Materialphysik, TU Dresden — 3Institut für Ionenstrahlphysik und Materialforschung, HZDR — 4Department of Physics, University of Warwick, Coventry UK — 5GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
We report on the investigation of changes on the magnetic properties induced by defects produced by He+-ion irradiation of the spin-ice compound Ho2 Ti2 O7. We irradiated the samples using He+-ions of 18 MeV energy and different doses. Magnetization M(H) and M(T) measurements revealed that the hallmark of spin-ice compounds, i.e., the appearance of a plateau in M(H), for the irradiated samples looks more defined and can be observed at even higher temperatures compared to the virgin sample. We have also observed systematic changes in the saturation magnetization and the Curie-Weiss temperature TCW compared to the virgin samples. Confocal Raman measurements reveal that the irradiation has induced considerable changes in the oxygen atoms tetrahedrally bonded to the holmium cations. Therefore, we conclude that the changes induced by irradiation are mostly due to the defects produced in the positions of the oxygen atoms.
Keywords: Spin Ice; Frustration; Magnetization; Irradiation