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TEM studies on the crystal structure of YBa2Cu3O7−x thin films prepared by pulsed laser deposition

Published online by Cambridge University Press:  31 January 2011

H. Takahashi ,
K. Ohata  and
T. Morishita
H. Takahashi
Affiliation:
Superconductivity Research Laboratory, ISTEC, 10-13, Shinonome 1-chome, Koto-ku, Tokyo 135, Japan
K. Ohata
Affiliation:
Superconductivity Research Laboratory, ISTEC, 10-13, Shinonome 1-chome, Koto-ku, Tokyo 135, Japan
T. Morishita
Affiliation:
Superconductivity Research Laboratory, ISTEC, 10-13, Shinonome 1-chome, Koto-ku, Tokyo 135, Japan
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Abstract

The crystal structures of YBa2Cu3O7−x thin films deposited on MgO(100) substrates have been investigated by cross-sectional transmission electron microscopy (TEM). At a substrate temperature of 670 °C, Cu–O chains become wavy. Stacking faults are formed between the Cu–O chains. Therefore, the domains with c-axis lattice constants of 15 Å, 27 Å, and 39 Å are observed. By applying a biasing voltage of + 300 V, deviation in the c-axis orientation is reduced compared to that at an unbiased condition; even some grain boundaries remain. Near substrate surfaces, deviation of the c-axis direction from the substrate normal increases with a decreasing substrate temperature from 700 °C to 670 °C. Application of a substrate bias voltage of +300 V improved the heteroepitaxial growth of the c-axis oriented YBa2Cu3O7−x.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 9 , September 1992 , pp. 2333 - 2336
Copyright
Copyright © Materials Research Society 1992

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