TY  - CONF
AU  - YIN, CHENYANG
AU  - CAO, LEI
AU  - HE, SUQIN
AU  - DUCHON, TOMAS
AU  - ZHOU, YUNXIA
AU  - PETRACIC, OLEG
AU  - BRÜCKEL, THOMAS
TI  - Tuning the physical properties of La0.7Sr0.3MnO3-δ via oxygen off-stoichiometry using thermal annealing
M1  - FZJ-2023-01283
PY  - 2023
AB  - The oxygen off-stoichiometry in La0.7Sr0.3MnO3-δ (LSMO) thin films on SrTiO3 (STO) substrates has been investigated employing Al-assisted vacuum annealing. The gradual deoxygenation during annealing induces a topotactic phase transition from the as-prepared Perovskite (PV, ABO3) phase to a layered oxygen-vacancy-ordered Brownmillerite (BM, ABO2.5) phase. The structural change is monitored by XRD. A metal-to-insulator and simultaneously a ferromagnetic (FM)-to-antiferromagnetic (AF) transition is found. The variation of the manganese oxidation state is characterized using XAS. The BM phase shows in magnetization vs. temperature curves a peculiar peak above room temperature which cannot be explained within the usual AF ordering at low temperatures. Moreover, to elucidate the role of the strain to the substrate, bulk-like LSMO powder samples were prepared and annealed at similar conditions as the film samples. Also here the PV-BM phase transition is achieved.
T2  - DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM)
CY  - 26 Mar 2023 - 31 Mar 2023, Dresden (Germany)
Y2  - 26 Mar 2023 - 31 Mar 2023
M2  - Dresden, Germany
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/1003867
ER  -