Optical microscope image showing extensive parallel cracks in a -thick YBCO thin film deposited on a (0 0 1) NGO substrate (in transmission mode).
Resistivity vs temperature measurement for two YBCO microbridges patterned at right angles to each other in directions that are with respect to the substrate’s (1 0 0) direction. The measurements indicate no significant anisotropy.
A measurement of a YBCO film deposited on a (0 0 1) NGO substrate. The orientation of the NGO substrate is indicated in the figure. This was determined using a second x-ray scan, which indicated the peaks lie along the direction of the substrate in reciprocal space, or equivalently, in its -axis direction in real space.
Schematic of the surface lattice of (0 0 1) NGO rotated 45° to clearly show the pseudocubic unit cell.
Schematic of the four possible domains in the YBCO/NGO system. The left-hand side of the figure shows the exaggerated mismatch between the film and the underlying substrate. The right-hand side shows the means by which the mismatch is accommodated through both strain as well as a small tilt of the YBCO unit cell. The fact that the substrate’s two diagonals are unequal necessitates two different rotation angles.
Schematic of the (a) and (b) twin-domain configurations and the corresponding diffraction patterns. The twinning creates preferential twin boundaries running along the (0 1 0) NGO direction with a diffraction peak splitting of along (1 0 0) NGO direction. The twinning creates preferential twin boundaries running along the (1 0 0) direction with a diffraction peak splitting of along the (0 1 0) NGO direction.
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