Journal ArticleDOI
Effect of grain network modifications due to additives on critical current (Ic) in Bi-2212 superconductor
K.S Ramesh,M. S. Ramachandra Rao +1 more
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In this paper, the effect of additives (Ag, Ag2O and BaBiO3) on the weak link behavior of Bi-2212 in bulk form was investigated and it was observed that the addition of silver (Ag) metal powder improves the connectivity between the grains by proximity effect and thereby enhances the current carrying capability at temperatures very close to Tc De Gennes and Clarke models.Abstract:
The presence of weak links in high-Tc superconductors is a major drawback in achieving high critical current densities The present study deals with the effect of additives (Ag, Ag2O and BaBiO3) on the weak link behaviour of Bi-2212 in bulk form It is observed that the addition of silver (Ag) metal powder improves the connectivity between the grains by proximity-effect and thereby enhances the current carrying capability at temperatures very close to Tc De Gennes and Clarke models have been invoked to establish that Bi-2212 containing insulating additives (BaBiO3 and Ag2O) show a superconductor–insulator–superconductor (S–I–S) type grain network and thereby enhance the weak link behaviour, whereas metallic Ag addition shows a superconductor–normal metal–superconductor (S–N–S) behaviour and is, therefore, a potential candidate for large scale applications Further support to this data is obtained from ac susceptibility studies carried out at different magnetic field strengths (01–40 Oe)read more
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Journal Article
Josephson Junction Model of Critical Current in Granular Y1Ba2Cu3O7-δ
TL;DR: In this paper, the transport critical-current density in a granular superconductor in magnetic fields below about 5 x 10/sup -3/T was calculated, and it was shown that Josephson junctions are limiting transport critical current in these samples and that they lie at the grain boundaries.
Journal ArticleDOI
Effect of doping Ba, Y V, Zn and Sn on BSCCO superconducting ceramics
TL;DR: In this paper, the effect of doping on the superconductivity in Bi/sub 2/Pb/sub 0.6/Sr/sr/sub 1/Ca, R/sub x/Cu/sub 3/O/sub /spl delta// (R=Ba,Y,V,Zn,Sn) has been investigated by resistivity, ac susceptibility measurements and x-ray diffraction (XRD) analysis.
Journal ArticleDOI
Development of Bulk Bi2+xSr3-yCa yCu 2O8+delta Superconductors by Partial-Melting Route for Fault Current Limiters Application
Bojan A. Marinkovic,Sike Xia,Luiz Antonio Saléh,Marcio Antonio Sens,E.T. Serra,Roberto R. de Avillez,Fernando Cosme Rizzo Assunção +6 more
TL;DR: In this article, the production of bulk Bi2+xSr3-yCayCu 2O8+D (Bi-2212) superconductors for fault current limiter application was developed via a partial-melting route.
References
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Journal ArticleDOI
Anisotropy of the critical current in silver sheathed (Bi,Pb)2Sr2Ca2Cu3O10 tapes
TL;DR: In this article, the transport critical current of Bi:2223 tapes was measured in magnetic fields up to 15 T and at temperatures from 4.2 to 84 K. At high temperatures, the critical current density Jc is strongly anisotropic and the anisotropy increases rapidly with magnetic field, whereas at low temperatures the critical currents are more stable.
Journal ArticleDOI
Evidence for homogeneous superconducting grains in high-Tc oxides.
TL;DR: Direct and magnetization critical current data on ceramic YBa/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta/ indicate that the ''homogeneous superconducting regions'' are much larger than the penetration depth and in fact are grain size, thus the current-limiting Josephson junctions in the high-T/sub c/ oxide ceramics must be intergranular rather than intragranular.
Journal ArticleDOI
AC losses and critical current density of superconducting GdBa2Cu3O7−x
M. Ciszek,J. Olejniczak,E. Trojnar,A. J. Zaleski,J. Klamut,A. J. M. Roovers,L.J.M. van de Klundert +6 more
TL;DR: In this paper, the authors examined the energy losses occurring in a cylindrical sample of Gd-Ba-Cu-O, subjected to an external AC magnetic field, and proposed an explanation for such behaviour.
Journal ArticleDOI
Factors suppressing transport critical current in Ag/Bi2223 tapes
TL;DR: In this paper, the microstructural factors limiting the critical current density have been investigated for the silver-sheathed Bi2223 tapes prepared by the powder-in-tube technique.
Journal ArticleDOI
Evidence that pair breaking at the grain boundaries of Bi2Sr2Ca2Cu3Ox tapes determines the critical current density above 10 K in high magnetic fields
TL;DR: In this article, the critical current density of an aligned Ag doped Bi2Sr2Ca2Cu3Ox tape has been measured from 10 K up to Tc (105 K) in magnetic fields up to 15 T.
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