SUPERCONDUCTING AND STRUCTURAL-PROPERTIES OF INPLANE ALIGNED A-AXIS ORIENTED YBA2CU3O7-X THIN-FILMS

We report the superconducting and structural properties of a-axis orie nted YBa2Cu3O7-x (YBCO) films as a function of deposition temperature of PrBa2Cu3O7-x (PBCO) template layers. X-ray diffraction (XRD) analys is revealed the orientation relationship in which the b axis of the PB CO template layers and the a axis of the YBCO films were normal to the LaSrGaO4 (100) substrate surface. In-plane aligned a-axis oriented YB CO films having a zero resistance temperature of 88 K and an anisotrop y ratio df resistivity of 11.5 at 275 K were obtained on PBCO template layers deposited at 630 degrees C among the deposition temperatures r anging from 600 to 650 degrees C at intervals of 10 degrees C. The deg ree of in-plane alignment of the a-axis oriented YBCO films which was estimated by the ratio of relative intensity at 90 degrees and 180 deg rees in the XRD phi scan of the (102) YBCO peak was 0.5, 0.045, and 0. 053 for the films on PBCO templates deposited at 620, 630, and 640 deg rees C, respectively. In conclusion, the deposition temperature of PBC O template layers is critical to fabricate the in-plane aligned a-axis oriented YBCO films on LaSrGaO4 (100) substrates. (C) 1995 American i nstitute of Physics.