Clemens, B. M. and Nieh, C. W. and Kittl, J. A. and Johnson, W. L. and Josefowicz, J. Y. and Hunter, A. T. (1988) Nucleation and growth of YBaCuO on SrTiO3. Applied Physics Letters, 53 (19). pp. 1871-1873. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:CLEapl88
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We have studied transmission electron microscopy (TEM) cross sections and plan views of YBaCuO films on SrTiO3 single-crystal substrates at various stages of post-deposition anneal. These TEM studies reveal in extraordinary detail the process of nucleation of epitaxial crystal structure characteristic of the films. In partially annealed samples sputtered from separate Cu, Y, and BaF2 sources, we see the 2-4-8 phase nucleates at the substrate interface, with the c axis parallel to the  substrate direction (surface normal). Upon further annealing, the 1-2-3 phase nucleates on this layer with the c axis parallel to each of the , , and  substrate directions. Rapid growth in the a- and b-axis directions results in an uneven "basket weave" surface texture. This information is crucial to the successful control and optimization of crystal orientation and surface morphology of superconducting thin films necessary for the application of this material to multilayer structures for electronic devices.
|Additional Information:||Copyright © 1988 American Institute of Physics. Received 26 August 1988; accepted 20 September 1988.|
|Subject Keywords:||TRANSMISSION ELECTRON MICROSCOPY, MORPHOLOGY, CRYSTAL GROWTH, NUCLEATION, INTERFACES, ANNEALING, CRYSTAL STRUCTURE, THIN FILMS, SUPERCONDUCTING FILMS, FABRICATION, YTTRIUM OXIDES, BARIUM OXIDES, COPPER OXIDES, STRONTIUM OXIDES, TITANIUM OXIDES, COATINGS, TEXTURE, MICROSTRUCTURE, SPUTTERING, COPPER, YTTRIUM, BARIUM FLUORIDES, EPITAXY, HIGH−TC SUPERCONDUCTORS, SOLID−PHASE EPITAXY|
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|Deposited By:||Archive Administrator|
|Deposited On:||26 Mar 2008|
|Last Modified:||26 Dec 2012 09:54|
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