Abstract
The superconductivity of YBa 2Cu 3O 7−∂ (YBCO) films grown on MgO substrate materials has been modified significantly using SrTiO 3 (STO) films as buffer layers. The role of the STO layer has been examined by conventional wide-angle X-ray diffraction (XRD), by atomic force microscopy (AFM) and by grazing-incident X-ray diffraction (GIXD) techniques and it has been found (i) to suppress the interaction between the films and the substrate materials and (ii) to enhance the nucleation and growth of (001)-oriented YBCO grains. The (001) epitaxial STO films are found to be of decisive importance to optimization of the superconductivity of the subsequently deposited YBCO films. Both the substrate temperature (720°C) and oxygen pressure (0.02 mbar) have to be stringently controlled for this purpose. The YBCO/STO/MgO films thus obtained possess excellent superconducting properties with T c =90 K and transition width δT=2 K.
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