1992
DOI: 10.1063/1.108004
|View full text |Cite
|
Sign up to set email alerts
|

Magneto-optical observation of flux pinning at the grain boundary in a Bi2Sr2CaCu2Ox superconductor

Abstract: Magnetic flux density distributions in a Bi2Sr2CaCu2Ox superconducting crystal for fields perpendicular to the bc plane are observed by a magneto-optical technique. It is recognized that flux is pinned at the low angle grain boundary while barely pinned at the high angle boundary or in the intragranular regions. The contributions of the low angle boundary to the critical current density and the magnetization are estimated from the magneto-optical results by using a flux pinning model, and then compared with th… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1
1

Citation Types

1
12
0

Year Published

1994
1994
2007
2007

Publication Types

Select...
8
2

Relationship

1
9

Authors

Journals

citations
Cited by 37 publications
(13 citation statements)
references
References 12 publications
1
12
0
Order By: Relevance
“…The T c values of individual crystals cut from the rod measured by low field ͑10 Oe͒ dc magnetization were approximately 87 K. The flux density distribution in the bc plane was observed by the high contrast magneto-optical flux imaging method ͑HICOM͒, 1 in which an iron garnet film is placed on the sample surface and the flux density distribution is visualized as a magnetic domain pattern of the garnet film by Faraday effect using a polarized microscope. The same phenomenon has been reported by Nakamura et al 4 On the other hand, in the case of zero field reduced after field cooling ͑FC͒ to 24 K in 850 Oe, white domains were observed in the same regions where maze domain patterns appeared in Fig. 1.…”
supporting
confidence: 87%
“…The T c values of individual crystals cut from the rod measured by low field ͑10 Oe͒ dc magnetization were approximately 87 K. The flux density distribution in the bc plane was observed by the high contrast magneto-optical flux imaging method ͑HICOM͒, 1 in which an iron garnet film is placed on the sample surface and the flux density distribution is visualized as a magnetic domain pattern of the garnet film by Faraday effect using a polarized microscope. The same phenomenon has been reported by Nakamura et al 4 On the other hand, in the case of zero field reduced after field cooling ͑FC͒ to 24 K in 850 Oe, white domains were observed in the same regions where maze domain patterns appeared in Fig. 1.…”
supporting
confidence: 87%
“…In polycrystalline samples, applied magnetic fields usually enter or leave the samples via the grain boundaries, preferably along those with large misorientation angles, as has been imaged directly in magneto-optical studies, an example of which is given by Fig. 50 (Forkl et al, 1990;Nakamura et al, 1992;Dorosinskii et al, 1993;Schuster et al, 1993;Koblischka et al, 1994;Turchinskaya et al, 1994;Vlasko-Vlasov et al, 1994;Polyanskii et al, 1996;Jooss et al, 1999;Albrecht et al, 2000aAlbrecht et al, , 2000bFeldmann et al, 2000;Jooss, Bringmann, et al, 2000;Kawano et al, 2000) and in scanning SQUID microscopy investigations (Tsai et al, 2001). With the field profile known, the supercurrent distributions can be derived by inversion techniques (Polyanskii et al, 1996;Jooss et al, 1999;Albrecht et al, 2000a;Kawano et al, 2000;Jooss, Albrecht, et al, 2001).…”
Section: J Penetration Of Magnetic Flux Into Grain Boundariesmentioning
confidence: 99%
“…Within the same temperature range there occurs an essential increase in <E>, most likely connected with the increase in the amount of low-angle boundaries too. It is well known that lowangle boundaries can be strong pinning centers [8,40,41]. That is why the increase in J c and B irr is attributed not only to the decrease in the amount of weak links at intercolony boundaries, but also to an increase of the mean effective pinning energy.…”
Section: Superconducting Propertiesmentioning
confidence: 94%