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The origin of preferential twinning in thin films deposited on the (0 0 1) substrate
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10.1063/1.1926395
/content/aip/journal/jap/97/12/10.1063/1.1926395
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/12/10.1063/1.1926395
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Optical microscope image showing extensive parallel cracks in a -thick YBCO thin film deposited on a (0 0 1) NGO substrate (in transmission mode).

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Schematic of the surface lattice of (0 0 1) NGO rotated 45° to clearly show the pseudocubic unit cell.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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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/content/aip/journal/jap/97/12/10.1063/1.1926395
2005-06-20
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The origin of preferential twinning in YBa2Cu3O7−δ thin films deposited on the (0 0 1) NdGaO3 substrate
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/12/10.1063/1.1926395
10.1063/1.1926395
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