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Influence of antiphase boundaries on critical current densities in Yba2Cu3O7−ysingle crystals

Published online by Cambridge University Press:  31 January 2011

Junko Shibata*
Affiliation:
Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
Akihiro Oka
Affiliation:
Superconductivity Research Laboratory, 1-10-13 Shinonome, Koto-ku 135-0062, Japan
Teruo Izumi
Affiliation:
Superconductivity Research Laboratory, 1-10-13 Shinonome, Koto-ku 135-0062, Japan
Yuh Shiohara
Affiliation:
Superconductivity Research Laboratory, 1-10-13 Shinonome, Koto-ku 135-0062, Japan
Tsukasa Hirayama
Affiliation:
Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
Yuichi Ikuhara
Affiliation:
Engineering Research Institute, School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
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Abstract

Twinned and detwinned Yba2Cu3O7−y (Y123) single crystals were observed by transmission electron microscopy to investigate the influences of the lattice defects on the peak effect for Y123 single crystals. Twin boundaries with the spacing of 0.2–0.5 μm were seen only in the twinned Y123 single crystals. Antiphase boundaries (APBs) along the (110)Y123 plane were observed in both twinned and 0.5h-detwinned samples, which showed the peak effect in high magnetic field over 3 T at 70 K. In contrast, APBs were not found in 100h-detwinned sample. Critical current densities of this sample were small all over the range of the applied magnetic field. In conclusion, we suggest that APBs have a significant influence on the peak effect of Y123 single crystals in the high magnetic field.

Type
Articles
Copyright
Copyright © Materials Research Society 2001

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References

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Influence of antiphase boundaries on critical current densities in Yba2Cu3O7−ysingle crystals
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