TITLE

In situ processing of epitaxial Y-Ba-Cu-O high Tc superconducting films on (100) SrTiO3 and (100) YS-ZrO2 substrates at 500–650 °C

AUTHOR(S)
Singh, R. K.; Narayan, J.; Singh, A. K.; Krishnaswamy, J.
PUB. DATE
May 1989
SOURCE
Applied Physics Letters;5/29/1989, Vol. 54 Issue 22, p2271
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report the formation of excellent quality epitaxial YBa2Cu3O7 films on (100) SrTiO3 and (100) ZrO2 (yttria stabilized) substrates in the temperature range of 500–650 °C by XECl excimer laser ablation in a 0.2 Torr oxygen ambient. By applying a dc bias voltage of +300 V to an interposing ring, we were able to reduce the substrate temperatures from 650 to 500 °C for obtaining epitaxial films. The quality of the epitaxial films was found to decrease with temperature, particularly below 550 °C. The thickness of the superconducting films was varied from 500 to 5000 Å with superconducting transition temperatures Tc (zero resistance) varying from 87 to 90 K for 650 °C deposits. The critical current density Jc of films was found to vary linearly with temperature with values of (zero magnetic field at 77 K) 5.0×106 and 1.0×106 for films deposited at 650 °C on (100) SrTiO3 and (100) yttria-stabilized zirconia substrates, respectively. X-ray diffraction, transmission electron microscopy, electron channeling patterns, and Rutherford backscattering (RBS)/channeling showed excellent epitaxial quality of films on both substrates with best values of minimum ion channeling yield of 3.5% on (100) SrTiO3 substrates.
ACCESSION #
9831391

 

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