Abstract
The surface morphology and growth mechanism of thin films of YBa 2Cu 3O 7 on a variety of single crystal substrates has been investigated using scanning tunneling microscopy. Over a wide range of deposition conditions c-axis films nucleate as islands and grow by a dislocation-mediated mechanism (spiral growth). a-axis films, on the other hand, grow by edge addition of vapor phase material to the component layers, giving a very different morphology. Many defect features associated with these growth patterns have been been observed and their dependence on deposition conditions and substrate material, as well as their importance for some superconducting properties is discussed.
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