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Preparation and growth mechanism of a-axis-oriented YBa2Cu3O7-δ films by laser metal-organic chemical vapor deposition

Published online by Cambridge University Press:  03 March 2011

Takahisa Ushida ,
Hiroyuki Higa ,
Kazutoshi Higashiyama  and
Izumi Hirabayashi
Takahisa Ushida
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, International Superconductivity Technology Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456, Japan
Hiroyuki Higa
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, International Superconductivity Technology Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456, Japan
Kazutoshi Higashiyama
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, International Superconductivity Technology Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456, Japan
Izumi Hirabayashi
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, International Superconductivity Technology Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456, Japan
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Abstract

Recently we have found a very effective method for controlling the orientation of YBCO films by metal-organic chemical vapor deposition (MOCVD) using uv laser irradiation during deposition onto a MgO(100) substrate. The irradiated part was strongly a-axis-oriented normal to the surface of the substrate for films prepared at 650-700 °C, whereas the unirradiated parts showed c-axis or (110) orientation. This phenomenon occurs not only on MgO(100) substrates but also on other substrates. We obtained a Tc above 81 K on the a-axis oriented part. The critical current density was over 105 A/cm2 at 4.2 K and O T. The surface morphology depends on the laser power density and the repetition rate. A high degree of the a-axis orientation is obtained only by using uv light during deposition of YBCO film. IR or a visible laser causes only surface melting and the destruction of film orientation. We propose that the nuclei for a-axis orientation are formed by the aggregation of Ba caused by uv laser irradiation near the film surface.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1067 - 1081
Copyright
Copyright © Materials Research Society 1994

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References

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