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Macrosegregation of Y2Ba1Cu1O5 particles in Y1Ba2Cu3O7−δ crystals grown by an undercooling method

Published online by Cambridge University Press:  31 January 2011

A. Endo ,
H. S. Chauhan ,
T. Egi  and
Y. Shiohara
A. Endo
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–10–13, Shinonome, Koto-ku, Tokyo, 135, Japan
H. S. Chauhan
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–10–13, Shinonome, Koto-ku, Tokyo, 135, Japan
T. Egi
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
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Abstract

Macrosegregation of Y2Ba1Cu1O5 (Y211) particles was observed in Pt-added Y1Ba2Cu3O7−δ (Y123) crystals grown by an undercooling method. It was found that the macrosegregation of Y211 particles depended on the growth direction and the growth rate (R) as a function of undercooling (ΔT). The amount of Y211 particles in Y123 crystals grown at large R was larger than at small R. Also, the amount of Y211 in Y123 growing along the a-direction was larger than that along the c-direction. Further, it was noted that the smaller Y211 particles in size were distributed in Y123 grown at large R. These phenomena could be at least qualitatively explained by the prevalent trapping/pushing theory. In the direct observation of magnetic flux with the Faraday effect of iron garnet film, the flux pinning force was found to be in good agreement with the macrosegregation of Y211 particles.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 4 , April 1996 , pp. 795 - 803
Copyright
Copyright © Materials Research Society 1996

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