Determination of antiferromagnetic order in brownmillerite La0.7Sr0.3MnO2.5 thin films
In transition metal oxides, oxygen vacancy distributions and dynamics are intrinsically coupled with magnetic, electronic and transport properties. However the role of oxygen content after sample preparation onto the physical properties is mostly unknown. The ability to control the oxygen composition after the preparation may provide the possibility to dynamically tune the physical properties and establish a comprehensive understanding of the structure-property relationship. In our work, the La0.7Sr0.3MnO3-δ thin films was prepared by high oxygen pressure sputtering. Using an in-situ x-ray diffraction setup we investigate the crystallographic properties while annealing the samples in vacuum. While annealing induces a desorption of oxygen, an oxygen vacancy driven phase transition to brownmillerite superlattice structure is observed. Interestingly, a (very likely) antiferromagnetic behavior with a Néel temperature of 46 K was observed in the final brownmillerite phase. Since there is no report about the magnetic properties of layered oxygen vacancy ordered thin films, it is important to provide an experimental evidence to interpret the magnetic behavior observed here.
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CAO Lei; PETRACIC Oleg; SCHMALZL Karin and SCHMIDT Wolfgang F. (2020). Determination of antiferromagnetic order in brownmillerite La0.7Sr0.3MnO2.5 thin films. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.CRG-2496
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