Overcoming weak links at grain boundaries in Bi2Sr2CaCu2Oxthick films by incorporation of superconducting whiskers
作者:
Ryoji Funahashi,
Ichiro Matsubara,
Lucangelo Dimesso,
Toru Ogura,
Kazuo Ueno,
Hiroshi Ishikawa,
Masayoshi Konishi,
Nobuhito Ohno,
期刊:
Applied Physics Letters
(AIP Available online 1996)
卷期:
Volume 68,
issue 25
页码: 3629-3631
ISSN:0003-6951
年代: 1996
DOI:10.1063/1.115752
出版商: AIP
数据来源: AIP
摘要:
Bi2Sr2CaCu2Ox(Bi‐2212) superconducting thick films incorporating Bi‐2212 superconducting whiskers have been prepared using a partial melting method. Hysteresis behavior of critical current density (Jc) for magnetic field is observed in a film without whiskers (monolithic film), but not noticeably in composite film (whisker content: 20 wt %). It is found from ac susceptibility measurement that a peak in &khgr;″, resulting from weak links, appears at a higher temperature for the composite film than for the monolithic film.Jcdecreases with increasing magnetic field more rapidly for the monolithic film than for the composite film less than 1 T. These results indicate that the incorporation of the whiskers is effective for overcoming weak links. In consequenceJcfor the composite film is about three times higher than for the monolithic film. It is clear from SEM observation that a microstructural improvement leads to an increase inJc. ©1996 American Institute of Physics.
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