Analysis and interpretation of critical current experiments for bismuth-based high-temperature superconductors made by powder-in-tube processing

Cha, Y.S.; Lanagan, Michael T.; Gray, K. E.; Jankus, V.Z.; Fang, Y.

doi:10.1016/0964-1807(94)90054-x

Cited by 21 publications

(9 citation statements)

References 13 publications

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“…11. Voltage along the length of an Ag/superconductor composite can be calculated from a one-dimensional model.…”

Section: Modelmentioning

confidence: 99%

“…In general, the current and voltage leads should be separated by at least 4.6/ ͑Ͻ1% of the current in the Ag͒ for J c measurement of Ag-sheathed tapes if Lӷ10. 11 For example, the ••• 7.5 10 a Cannot measure V b from the cut because current is shared in both Ag and BSCCO. b i is calculated from Eq.…”

Section: A J C Measurement In Ag-sheathed Tapesmentioning

confidence: 99%

“…Several models can be used to explain the transport properties of high-T c superconducting tapes. [8][9][10] Our previous model 11 analyzed the current distribution in Ag/BSCCO and assumed that current was shunted around each grain boundary in the BSCCO core. The calculated J c from this analysis was lower than that measured in actual PIT tapes and increased in proportion to the distance between defects.…”

Section: Introductionmentioning

confidence: 99%

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Modeling voltage distribution and current limit in Ag/Bi2Sr2Can−1CunO2n+4

Fang

Danyluk

et al. 1996

Journal of Applied Physics

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Limitations on the critical current density in Bi2Sr2CaCu2O8 films grown on MgO(001) by metalorganic deposition Current and voltage distributions in Ag/Bi 2 Sr 2 Ca nϪ1 Cu n O 2nϩ4 ͑BSCCO͒ composites are calculated from an analytical model that is based on interfacial resistivity and geometric parameters. The model was verified by measuring the voltage distribution along Ag/Bi 2 Sr 2 Ca 2 Cu 3 O 10 bars that were fabricated by sinter forging between 400-845°C and 5-10 MPa. The results show that the solutions depend on a single dimensionless parameter, L, where L is the length of the interface and is associated with resistivity of the Ag ͑ s ͒, interfacial resistivity ͑ i ͒ between the Ag and the BSCCO, and thickness of the Ag ͑d s ͒. The voltage drop across the interface is proportional to ( i s /d s ͒ 1/2 . The model was extended for powder-in-tube tapes to examine the effects of cracking on critical current density.

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“…11. Voltage along the length of an Ag/superconductor composite can be calculated from a one-dimensional model.…”

Section: Modelmentioning

confidence: 99%

Section: A J C Measurement In Ag-sheathed Tapesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling voltage distribution and current limit in Ag/Bi2Sr2Can−1CunO2n+4

Fang

Danyluk

et al. 1996

Journal of Applied Physics

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“…In the case of symmetry, I c is flowing in the superconductor only in the centre of the segment and the difference I − I c flows in the matrix. Applying mathematical analysis to an equivalent network model as introduced by Gauster et al [16] and applied also in [4,5], it can be shown that the voltage drop measured on a half-matrix segment l is…”

Section: Partial Conclusion and Discussionmentioning

confidence: 99%

“…However, this simple idea is not obvious because of the inhomogeneity of the superconducting core. Therefore, studies were performed modelling the current transfer process between the core and the matrix [4,5].…”

Section: Introductionmentioning

confidence: 99%

Ag-sheath magnetoresistance anisotropy in Bi(2223)/Ag multifilamentary tapes at 4.2 K

Cesnak

Kòváč

1998

Supercond. Sci. Technol.

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The magnetoresistance of three different pure Ag, respectively BSCCO/Ag, tapes was examined. Further, the voltage-current characteristics of two 19-filament Bi(2223)/Ag short samples differing by current carrying capability were measured at 4.2 K in magnetic fields up to 10 T. The voltage-current characteristics were used to evaluate the differential resistance in the resistive regime as a function of current. The saturated value of the differential resistance was determined by extrapolation to relatively high currents and it was considered as the apparent silver sheath resistance. It showed a very low value in spite of various technological steps during preparation. It agreed well with the calculated value using the resistivity of the long-time heat treated pure Ag sample. The magnetic field-induced increase in resistance calculated in this way was lower than that, or approximately equal to that, measured in the transverse position with the broad face parallel with the magnetic field and/or in the longitudinal position. In contrast, in the transverse position with the broad face perpendicular to the magnetic field, the magnetoresistance was higher than the calculated one. The observed anisotropy ratio of the apparent silver sheath magnetoresistance was close to 2. Some mechanisms that could be responsible for such behaviour are discussed.

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