Room temperature oxidation of YBCO thin-film by μs pulsed electrolysis in aqueous solution

摘要

In this paper the oxygen deficiency of YBa2Cu3O7-x (YBCO) films has been decreased at room temperature by the anode oxidation in an aqueous solution of LiOH (0.3 N). The anode oxidation of the films has been performed by μs pulsed electrolysis by means of short (1.3 μs) and high current peak (up to 15.2 A) with a low duty cycle at 5 KHz. The very high oxygen equivalent pressure on the electrode surface allows one to increase the oxygen stoichiometry with a simple experimental set-up. The films have been characterized by the X-ray diffraction (XRD) and the temperature dependence of the dc resistivity. It appears that the pulsed electrolysis allows one to enhance the critical temperature with a corresponding transition from the "semiconducting" to the "metallic" behavior of the temperature dependence of the resistivity.