Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 4: Magnetic Heusler Compounds and Complex Magnetic Oxides
MA 4.11: Vortrag
Montag, 18. März 2024, 12:15–12:30, EB 107
Tuning the physical properties of La0.7Sr0.3MnO(3-δ) via oxygen off-stoichiometry using assisted thermal vacuum annealing — •Chenyang Yin1,2, Lei Cao2, Suqin He3,2, Tomas Duchon4, Yunxia Zhou5, Denis Sheptyakov6, Maria Teresa Fernandez-Diaz7, Shibabrata Nandi2, and Oleg Petracic2,1 — 1Heinrich Heine University Düsseldorf, Faculty of Mathematics and Natural Sciences, Düsseldorf, Germany — 2Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany — 3Peter Grünberg Institut (PGI-7), JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany — 4Peter Grünberg Institut (PGI-6), JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany — 5Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany — 6Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — 7Institut Laue-Langevin (ILL), Grenoble, France
In La0.7Sr0.3MnO(3-δ) (LSMO), the topotactic phase transition from the Perovskite (PV) phase to the layered oxygen-vacancy-ordered Brownmillerite (BM) phase can be triggered by deoxygenation. We realized this phase transition in both a strained LSMO thin film system and bulk-like unstrained LSMO powder system via assisted thermal vacuum annealing. For thin film, A metal-to-insulator and simultaneously a ferromagnetic-to-antiferromagnetic transition is found. For powder, the evolution of crystal and spin structure at different oxygen-deficient states from PV to BM is determined using neutron diffraction.
Keywords: LSMO; oxygen vacancy; topotactic phase transition; magnetic structure; complex oxides