Preparation of YBCO Superconducting Thin Film by Pulsed Thermal Decomposition of Ultrasonic-Misted Nitrate Solution

Abstract

ABSTRACTYBa2Cu3O7-x superconducting thin films have been prepared by a new material preparation method, namely pulsed thermal decomposition of ultrasonic-misted nitrate solution. The prepared films have been studied by using powder X-ray diffraction method, scanning electron microscopy and Rutherford backscattering spectrometry. The results obtained indicate (1) that by local heating of the substrate with an infrared lamp, c-axis oriented YBa2Cu3O7-x films can be deposited without segregation of impurity phases, (2) that a high decomposition temperature is necessary to increase flatness of thin YBa2Cu3O7-x films although a sufficient margin temperature is required to obtain impurity-phase-free films, and (3) that the efficiency of the process increases if the adhesion is large between the deposited film and the substrate.