Magnetic field dependent critical current density of Bi-Sr-Ca-Cu-O superconductor in bulk and tape form with addition of Fe3 O4 magnetic nanoparticles

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Abstract

The (Bi,Pb) 2 Sr2 Ca2 Cu3 O10 - (Fe3 O4) x superconductor for x=0, 0.01, 0.03, and 0.05 were prepared. The average size of Fe3 O4 used was 40 nm. The maximum critical current density (Jc) in the bulk form was observed in the x=0.01 sample. Based on this result, Ag sheathed high temperature superconductor tapes with starting compositions (Bi,Pb) 2 Sr2 Ca2 Cu3 O10 - (Fe3 O4) 0.01 were fabricated using the powder in tube method. The microstructure, phase formation, critical temperature, and transport critical current density were studied. The Jc of the nanosized Fe3 O4 added tapes is 5130 A/ cm2 at 77 K and 23130 A/ cm2 at 30 K in zero fields. The nonadded tapes showed a lower Jc, 3090 A/ cm2 at 77 K and 12 400 A/ cm2 at 30 K. A sudden decrease in Jc in low magnetic fields (B<0.10 T) when applied parallel and perpendicular to the tapes surface was observed. By adding magnetic nanoparticles, the full vortex magnetic energy can be used to enhance Jc and thus, magnetic nanoparticles such as Fe3 O4 can act as an effective flux pinning center leading to the enhancement of Jc in the bulk as well as the tape form.

Original languageEnglish
Article number07E311
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
Publication statusPublished - 2009

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BSCCO superconductors
tapes
critical current
current density
nanoparticles
magnetic fields
flux pinning
high temperature superconductors
critical temperature
vortices
tubes
microstructure
augmentation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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abstract = "The (Bi,Pb) 2 Sr2 Ca2 Cu3 O10 - (Fe3 O4) x superconductor for x=0, 0.01, 0.03, and 0.05 were prepared. The average size of Fe3 O4 used was 40 nm. The maximum critical current density (Jc) in the bulk form was observed in the x=0.01 sample. Based on this result, Ag sheathed high temperature superconductor tapes with starting compositions (Bi,Pb) 2 Sr2 Ca2 Cu3 O10 - (Fe3 O4) 0.01 were fabricated using the powder in tube method. The microstructure, phase formation, critical temperature, and transport critical current density were studied. The Jc of the nanosized Fe3 O4 added tapes is 5130 A/ cm2 at 77 K and 23130 A/ cm2 at 30 K in zero fields. The nonadded tapes showed a lower Jc, 3090 A/ cm2 at 77 K and 12 400 A/ cm2 at 30 K. A sudden decrease in Jc in low magnetic fields (B<0.10 T) when applied parallel and perpendicular to the tapes surface was observed. By adding magnetic nanoparticles, the full vortex magnetic energy can be used to enhance Jc and thus, magnetic nanoparticles such as Fe3 O4 can act as an effective flux pinning center leading to the enhancement of Jc in the bulk as well as the tape form.",
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AB - The (Bi,Pb) 2 Sr2 Ca2 Cu3 O10 - (Fe3 O4) x superconductor for x=0, 0.01, 0.03, and 0.05 were prepared. The average size of Fe3 O4 used was 40 nm. The maximum critical current density (Jc) in the bulk form was observed in the x=0.01 sample. Based on this result, Ag sheathed high temperature superconductor tapes with starting compositions (Bi,Pb) 2 Sr2 Ca2 Cu3 O10 - (Fe3 O4) 0.01 were fabricated using the powder in tube method. The microstructure, phase formation, critical temperature, and transport critical current density were studied. The Jc of the nanosized Fe3 O4 added tapes is 5130 A/ cm2 at 77 K and 23130 A/ cm2 at 30 K in zero fields. The nonadded tapes showed a lower Jc, 3090 A/ cm2 at 77 K and 12 400 A/ cm2 at 30 K. A sudden decrease in Jc in low magnetic fields (B<0.10 T) when applied parallel and perpendicular to the tapes surface was observed. By adding magnetic nanoparticles, the full vortex magnetic energy can be used to enhance Jc and thus, magnetic nanoparticles such as Fe3 O4 can act as an effective flux pinning center leading to the enhancement of Jc in the bulk as well as the tape form.

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