The effect of twin boundaries on the flux pinning in MPMG processed YBCO

Hiroyuki Fujimoto; Takahiro Taguchi; Masato Murakami; Naoki Koshizuka

doi:10.1016/0921-4534(93)90146-H

The effect of twin boundaries on the flux pinning in MPMG processed YBCO

Hiroyuki Fujimoto, Takahiro Taguchi, Masato Murakami, Naoki Koshizuka

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

19 Citations (Scopus)

Abstract

Using magnetic measurements we have investigated the effect of twin boundaries on flux pinning over the temperature range of 4.2 to 85 K in YBaCuO superconductors prepared by the melt-powder-melt-growth process (MPMG). It has been found that non-superconducting Y₂BaCuO₅ (211) particles dispersed in the 123 matrix can work as strong pinning centers, resulting in higher J_c values. Despite non-superconducting 211 particles being the main pinning centers, defects such as twin boundaries, oxygen deficiency and stacking faults are also considered to be possible pinning centers in melt-processed YBCO. An enhancement of J_c was observed when the magnetic field was applied parallel to the twin planes. The results indicate that twin planes contribute to flux pinning, but that their effect is not very large in MPMG processed samples.

Original language	English
Pages (from-to)	393-403
Number of pages	11
Journal	Physica C: Superconductivity and its applications
Volume	211
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(93)90146-H
Publication status	Published - 1993 Jun 20
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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abstract = "Using magnetic measurements we have investigated the effect of twin boundaries on flux pinning over the temperature range of 4.2 to 85 K in YBaCuO superconductors prepared by the melt-powder-melt-growth process (MPMG). It has been found that non-superconducting Y2BaCuO5 (211) particles dispersed in the 123 matrix can work as strong pinning centers, resulting in higher Jc values. Despite non-superconducting 211 particles being the main pinning centers, defects such as twin boundaries, oxygen deficiency and stacking faults are also considered to be possible pinning centers in melt-processed YBCO. An enhancement of Jc was observed when the magnetic field was applied parallel to the twin planes. The results indicate that twin planes contribute to flux pinning, but that their effect is not very large in MPMG processed samples.",

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AU - Murakami, Masato

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PY - 1993/6/20

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