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@INPROCEEDINGS{He:1031668,
      author       = {He, Suqin and Petracic, Oleg and Cao, Lei and Lauter,
                      Valeria and Zhou, Yunxia and Weber, Moritz and Schubert,
                      Jürgen and Dittmann, Regina and Waser, R. and Brückel,
                      Thomas and Gunkel, Felix},
      title        = {{S}tructural, magnetic and electrical properties of
                      oxygendeficient{L}a(0.6){S}r(0.4){C}o{O}(3-δ) thin films},
      reportid     = {FZJ-2024-05778},
      year         = {2024},
      abstract     = {Controlled oxygen release or uptake in complex oxides can
                      induce changes of the crystal structureand simultaneously of
                      the magnetic and electrical properties. Consequently, a
                      systematic control ofthe oxygen stoichiometry can enable
                      potential applications in spintronics, solid oxide fuel
                      cells andcatalysts. In La0.6Sr0.4CoO3-δ (LSCO) the gradual
                      oxygen release triggers a phase transition fromthe initial
                      ferromagnetic (FM) perovskite (PV) structure to an oxygen
                      vacancy layered antiferromagnetic(AFM) brownmillerite (BM)
                      structure.We have studied LSCO thin films fabricated by
                      pulsed laser deposition (PLD). In situ x-ray
                      diffractionduring thermal annealing reveals the topotactic
                      phase transition of the LSCO thin films, which can
                      beattributed to the release of oxygen and ultimately the
                      transition to a coherently ordered BM phase.By comparing the
                      magnetic and electronic properties of the sample at
                      different oxygen deficientstates, we demonstrate that the
                      magnetic and electronic transitions are apart from the
                      structuralphase transition [1].Using in situ polarized
                      neutron reflectometry (PNR) measured at the MR reflectometer
                      (SNS/OakRidge), we explore the nuclear scattering density
                      (nSLD) and quantify the change in oxygen stoichiometryand
                      the magnetization of the LSCO film during annealing. The PNR
                      data shows a significantdecrease of nSLD for the annealed
                      film indicating a reduction in oxygen concentration. The
                      oxygenstoichiometry is found to vary from La0.6Sr0.4CoO3
                      before annealing to about La0.6Sr0.4CoO2.5for annealed
                      films. We find that disordered oxygen vacancies forming in
                      the initial phase of annealingquickly govern the magnetic
                      properties of the film by triggering a FM to AF transition
                      [1].[1] S. He, O. Petracic, V. Lauter, L. Cao, Y. Zhou, M.
                      L. Weber, J. Schubert, O. Concepción, R. Dittmann, R.
                      Waser, T. Brückel, F. Gunkel, La0.6Sr0.4CoO3−δ Films
                      Under Deoxygenation: Magnetic And Electronic Transitions Are
                      Apart from The Structural Phase TransitionAdv. Funct. Mater.
                      2024, 34, 2313208.},
      month         = {Oct},
      date          = {2024-10-08},
      organization  = {JCNS Workshop 2024, Trends and
                       Perspectives in Neutron Scattering:
                       Functional Interfaces, Evangelische
                       Akademie Tutzing (Germany), 8 Oct 2024
                       - 11 Oct 2024},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / PGI-7 / PGI-9},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-7-20110106 / I:(DE-Juel1)PGI-9-20110106},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1031668},
}