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The a/c axes grain boundaries of YBCO films are very interesting from the viewpoints of Josephson junction technology and the magnetic flux pinning. In this paper, we intend to flow superconducting current along the grain boundary and to prevent the magnetic flux motion from passing across the grain boundary. The a/c axes grain boundaries were fabricated on SrLaGaO4 (100) substrates by pulsed laser deposition on Gd2CuO4 (GCO) buffer layers. The preferred orientation and in-plane orientation of the films were characterized by X-ray θ/2θ diffraction and φ-scan spectroscopy. 4-micrometer pitch GCO patterns were fabricated by a lithography technology. Subsequently, the YBCO films were deposited on the pattern. A TEM image showed that a-axis grains grew over c-axis grains.
Date of Publication: June 2005