Chemical Oxidation of La₂CuO₄ Epitaxial Thin Films Grown by Pulsed Laser Deposition

Chemical oxidation is used to induce superconductivity in La₂CuO₄ expitaxial thin films fabricated by pulsed laser deposition technique. Details about the influence of oxidation time on structural, surface morphology, Raman spectra, and electrical properties have been investigated. The results convince that successful uptake of oxygen occurs in the oxidized films, and the content of the inserted oxygen increases with increasing oxidation interval. The possible mechanism for the excess oxygen insertion into the film is also discussed.