Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.67: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Reversible tuning of structural, magnetic and transport properties via oxygen desorption/absorption in epitaxial La(0.7)Sr(0.3)MnO(3-δ) thin films — Lei Cao1, •Oleg Petracic1, Paul Zakalek1, Alexander Weber2, Ulrich Rücker1, Jürgen Schubert3, Alexandros Koutsioubas2, Stefan Mattauch2, and Thomas Brückel1 — 1Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT Forschungszentrum Jülich GmbH, Jülich, Germany — 2Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ) Forschungszentrum Jülich GmbH, Garching, Germany — 3Peter Grünberg Institute (PGI9-IT), JARA-Fundamentals of Future Information Technology Forschungszentrum Jülich GmbH, Jülich, Germany
An oxygen vacancy induced topotactic transition from perovskite to brownmillerite and vice versa in epitaxial La(0.7)Sr(0.3)MnO(3-δ) thin films is identified by real-time x-ray diffraction. A novel intermediate phase with a non-centered crystal structure is observed for the first time during the topotactic phase conversion which indicates a distinctive transition route. Polarized neutron reflectometry confirms an oxygen deficient interfacial layer with drastically reduced nuclear scattering length density, further enabling a quantitative determination of the oxygen stoichiometry (La(0.7)Sr(0.3)MnO(2.65)) for the intermediate state. Associated physical properties of distinct topotactic phases (i.e. ferromagnetic metal and anti-ferromagnetic insulator) can be switched reversibly by an oxygen desorption/absorption cycling process.