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Aspects of annealing and free surface crystallization of YBCO thin films |
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| Authors: | S W Filipczuk and R Driver G B Smith |
| Institution: | CSIRO Division of Applied Physics, PO Box 218, Lindfield, NSW, 2070, Australia Department of Applied Physics, University of Technology, Sydney, PO Box 123, Broadway, NSW, 2007, Australia |
| Abstract: | We describe a method of high temperature annealing in which the control of oxygen partial pressure is the principal experimental determinant in obtaining highly c oriented thin films of YBa2Cu3O7 ? δ on YSZ. Film crystallization, morphology and substrate interactions are discussed with detailed reference to the equilibria existing in the YBCO system. A model based on the melt-assisted crystallization of the precursor tetragonal compound, beginning at the free film surface, is used to explain the observed c texturing. Excellent Josephson coupling between grains of YBa2Cu3O7 ? δ in our films is related to melt-assisted growth. We discuss the adverse effects of annealing in pure oxygen at high temperatures. |
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