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YBa2Cu3O7−x Grain Boundary Weak Links on MgO Bicrystal

Published online by Cambridge University Press:  26 February 2011

H. B. Lu ,
S. L. Tu ,
J. J. Wang ,
J. Lin ,
T. W. Huang ,
S. J. Yang  and
S. E. Hsu
H. B. Lu
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and Technology, Lung-Tan, Taoyuan, Taiwan 32526, Republic of China
S. L. Tu
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and Technology, Lung-Tan, Taoyuan, Taiwan 32526, Republic of China
J. J. Wang
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and Technology, Lung-Tan, Taoyuan, Taiwan 32526, Republic of China
J. Lin
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and Technology, Lung-Tan, Taoyuan, Taiwan 32526, Republic of China
T. W. Huang
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and Technology, Lung-Tan, Taoyuan, Taiwan 32526, Republic of China
S. J. Yang
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and Technology, Lung-Tan, Taoyuan, Taiwan 32526, Republic of China
S. E. Hsu
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and Technology, Lung-Tan, Taoyuan, Taiwan 32526, Republic of China
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Abstract

The characteristics of YBa2Cu3O7−x (YBCO) thin films by laser ablation on MgO bicrystals have been investigated. The bicrystals were fabricated by hot pressing two single crystals with the configuration of [001] tilt boundaries. The YBCO films were epitaxial grown with C-axis normal to the both adjacent grains of bicrystals. The FWHM about (005) reflection was 0.4–0.5 degree, indicating the high degree of the oriention for the film with small mosaic spread. Our preliminary study showed that the typical value of Jc on either side of the bicrystal boundary was 0.4–10×106 A/cm2 at 15K, while that across the 10° tilt boundaries was 0.3–9×105 A/cm2 at 15K. These results implied that the artificial grain boundaries effectively weakened the supercurrent, and therefore, the weak-link properties of artificial boundaries were more easily controllable than those of naturally occuring grain boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 873
Copyright
Copyright © Materials Research Society 1992

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References

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