Abstract
The microstructure and chemical expansion of annealed and unannealed La0.67Sr0.33CoO3 (LSCO) thin films were investigated using high-resolution transmission electron microscopy (HRTEM). In both annealed and unannealed LSCO thin films, the modulated structure in La/Sr planes (A-sites) was discovered, which is ascribed to the cation ordering. However, the oxygen vacancy ordering induced modulated structure in Co–O planes (B-sites) only appeared in the vacuum-annealed LSCO thin films. In addition, the anisotropic chemical expansion was only observed in the vacuum-annealed LSCO films and the anisotropic elongation is associated with the modulated structures in the Co–O planes. What's more, the electrical and magnetic properties of the LSCO thin films were studied before and after annealing in the vacuum. The ferromagnetic-metallic LSCO thin films turned into a non-magnetic insulator after the annealing in vacuum, which is attributed to appearance of the oxygen vacancy ordering in the vacuum-annealed LSCO films.
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