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Crystallinity of YBa2Cu3O7−x single crystals grown by the pulling method

Published online by Cambridge University Press:  31 January 2011

Y. Namikawa ,
M. Egami ,
S. Koyama ,
Y. Shiohara  and
H. Kutami
Y. Namikawa
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–10–13 Shinonome, Koto-Ku, Tokyo 135, Japan
M. Egami
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–10–13 Shinonome, Koto-Ku, Tokyo 135, Japan
S. Koyama
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–10–13 Shinonome, Koto-Ku, Tokyo 135, Japan
Y. Shiohara
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–10–13 Shinonome, Koto-Ku, Tokyo 135, Japan
H. Kutami
Affiliation:
Research Laboratory Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-Ku, Yokohama 227, Japan
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Abstract

Large YBa2Cu3O7−x (Y123) single crystals (larger than 13 mm cubed) have been grown along the c-axis reproducibly by the modified pulling method. The crystallinity of Y123 single crystal was investigated by x-ray diffraction and x-ray topography. Crystals grown from an MgO single crystal seed had some low angle subgrain boundaries which tilted 0.1–0.8° from each other. These grain boundaries originated from the seed crystal, and the subgrains were extended along the growth direction from the seed crystal. Y123 single crystals with no marked subgrains in the whole area were obtained by using Y123 single subgrain crystal seeds. FWHM of the x-ray rocking curve for the crystal so produced was about 0.14°, which was much better than the spectrum consisting of several separated peaks obtained from the previous crystals. Tc onset of the annealed sample was about 93.6 K, and the transition width was about 0.9 K. The low angle subgrain boundaries did not seem to be effective pinning centers for the magnetic flux.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 4 , April 1996 , pp. 804 - 812
Copyright
Copyright © Materials Research Society 1996

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References

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