| Summary: | The perovskite LaCoO<sub>3</sub> and La<sub>0.8</sub>Sr<sub>0.2</sub>CoO<sub>3</sub> thin films were synthesized successfully by a polymer-assisted deposition method. The structural characterization and thermal decomposition measurements indicate that appropriately increasing the annealing temperature is helpful in improving the film crystallinity. Compared with LaCoO<sub>3</sub> films, the Curie temperature is enhanced to a higher temperature in La<sub>0.8</sub>Sr<sub>0.2</sub>CoO<sub>3</sub> films, which is attributed to the changes in both the valence state and spin state induced by the chemical doping. In addition, a broad transition temperature region is observed in La<sub>0.8</sub>Sr<sub>0.2</sub>CoO<sub>3</sub> films, revealing the existence of inhomogeneous ground states in this system.
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