Abstract
Thin films of lanthanum cuprate withc-axis texture weregrown on gold covered SrTiO3 substrates by pulsed laser deposition. Superconductivity has been introduced into thesefilms through the process of post-deposition chemical oxidation using NaClO solution.The systematic change in resistance of the oxidized films suggests that the filmsundergo a change from an underdoped state to an overdoped state as the oxidationtime increases. The absence of the time effect found in the chemical oxidation ofLa2CuO4 epitaxial thin films evidences that grain orientations have a strong effect on theoxidation behaviour of these films. Raman analyses reveal that the thickness of theoxidized film decreases with increasing oxidation time. These results indicate thatc-axis textured LCO thin films resemble powder samples rather than epitaxial thin films, inthe light of their chemical oxidation behaviours.
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