This title appears in the Scientific Report :
2023
Tuning the physical properties of La0.7Sr0.3MnO3-δ via oxygen off-stoichiometry using thermal annealing
Tuning the physical properties of La0.7Sr0.3MnO3-δ via oxygen off-stoichiometry using thermal annealing
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 o...
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Personal Name(s): | YIN, CHENYANG |
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CAO, LEI / HE, SUQIN / DUCHON, TOMAS / ZHOU, YUNXIA / PETRACIC, OLEG / BRÜCKEL, THOMAS | |
Contributing Institute: |
Streumethoden; JCNS-2 Elektronische Materialien; PGI-7 Elektronische Eigenschaften; PGI-6 JARA-FIT; JARA-FIT Streumethoden; PGI-4 |
Imprint: |
2023
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Conference: | DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM), Dresden (Germany), 2023-03-26 - 2023-03-31 |
Document Type: |
Poster |
Research Program: |
Jülich Centre for Neutron Research (JCNS) (FZJ) Materials – Quantum, Complex and Functional Materials |
Publikationsportal JuSER |
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. |