Conference Presentation (Invited)

FZJ-2026-02191

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Multi-length scale investigation of the Perovskite-Brownmillerite topotacticphase transition in La0.7Sr0.3MnO3−δ thin films

Yin, C.FZJ* ; Bai, X.FZJ* ; Xu, Z. ; Lauter, V. ; Zhou, S. ; Gunkel, F.FZJ* ; Cao, L. ; Puebla Hellmann, G. ; Dunin-Borkowski, R. E.FZJ* ; Petracic, O.FZJ*

2026

Abstract: In La0.7Sr0.3MnO3−δ , the introduction of oxygen vacancies induces a topotacticphase transition from the perovskite phase to an oxygen-vacancy orderedBrownmillerite phase. The influence of oxygen vacancies on near-surface magneticdomains is probed via Nitrogen-Vacancy (NV) magnetometry. PolarizedNeutron Reflectometry (PNR) provide depth-resolved magnetization profilesand oxygen stoichiometry. Scanning Transmission ElectronMicroscopy (STEM)elucidates the atomic structure and depth-dependent oxidation states.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. JARA-FIT (JARA-FIT)
3. Physik Nanoskaliger Systeme (ER-C-1)
4. Elektronische Materialien (PGI-7)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)

Appears in the scientific report 2026

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