Superconducting properties and microstructures of Er-Ba-Cu-O superconductor

K. Iida; J. Yoshioka; N. Sakai; M. Murakami

doi:10.1088/0953-2048/16/6/308

Superconducting properties and microstructures of Er-Ba-Cu-O superconductor

K. Iida, J. Yoshioka, N. Sakai, M. Murakami

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The growth rate of Er-Ba-Cu-O bulk superconductor as a function for undercooling was investigated using an isothermal solidification technique. The behaviour of the growth rate of Er-Ba-Cu-O under various undercooling was similar to that of Y-Ba-Cu-O. Furthermore, macro-segregation of Er211 was also observed in the a and c growth regions. However, macro-segregation of Er211 was not observed in the Er123 crystal fabricated by a continual slow cooling method far from the seed crystal. The optimum concentration of Er211 was determined to be Er123:Er211 = 3:1 on the basis of microstructure analysis and SQUID measurements. Furthermore, the trapped field capability as well as the critical current density of Er-Ba-Cu-O bulk superconductor with an optimum composition fabricated by a continual slow cooling method employing very small particles of Er211 was dramatically improved.

Original language	English
Pages (from-to)	699-706
Number of pages	8
Journal	Superconductor Science and Technology
Volume	16
Issue number	6
DOIs	https://doi.org/10.1088/0953-2048/16/6/308
Publication status	Published - 2003 Jun 1
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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AU - Yoshioka, J.

AU - Sakai, N.

AU - Murakami, M.

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AB - The growth rate of Er-Ba-Cu-O bulk superconductor as a function for undercooling was investigated using an isothermal solidification technique. The behaviour of the growth rate of Er-Ba-Cu-O under various undercooling was similar to that of Y-Ba-Cu-O. Furthermore, macro-segregation of Er211 was also observed in the a and c growth regions. However, macro-segregation of Er211 was not observed in the Er123 crystal fabricated by a continual slow cooling method far from the seed crystal. The optimum concentration of Er211 was determined to be Er123:Er211 = 3:1 on the basis of microstructure analysis and SQUID measurements. Furthermore, the trapped field capability as well as the critical current density of Er-Ba-Cu-O bulk superconductor with an optimum composition fabricated by a continual slow cooling method employing very small particles of Er211 was dramatically improved.

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