Current-voltage curves and critical current densities of monocore Ag-clad (Bi,Pb)2Sr2Ca2Cu3O10+x tapes for currents applied perpendicular and parallel to the tape plane

M. Polak, M. Majoros, Jaakko Paasi

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We analysed I–V curves of a monocore, Ag-clad (Bi, Pb)2Sr2Ca2Cu3O10+x tape measured with current flowing perpendicular to its broad face. The measurements showed that the boundary superconductor/Ag has a resistive character.
We have also found that in this experimental configuration the edges of the core connecting its upper and lower surface layer influence I–V curves in a decisive way. For the sample prepared from the original tape with an intact core and Ag edges, the shape of the I–V curves measured with perpendicular current was similar to those measured with current flowing parallel to the tape axis. The shape of the I–V curves for perpendicular current drastically changed if we interrupted the connections between the surface core layers by cutting off the core edges.
The observed I–V curves exhibited two bends indicating the presence of two layers with two different critical current densities in the direction perpendicular to the broad face of the core. The higher Jc was 270 A cm−2 and the lower one was 150 A cm−2 (in zero external magnetic field at 77 K). Both Jc values were considerably lower than the value of Jc = 1 × 104 A cm−2 measured with current flowing parallel to the tape axis.
Original languageEnglish
Pages (from-to)1628-1634
JournalSuperconductor Science and Technology
Volume15
Issue number11
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

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Superconducting materials
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magnetic fields

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title = "Current-voltage curves and critical current densities of monocore Ag-clad (Bi,Pb)2Sr2Ca2Cu3O10+x tapes for currents applied perpendicular and parallel to the tape plane",
abstract = "We analysed I–V curves of a monocore, Ag-clad (Bi, Pb)2Sr2Ca2Cu3O10+x tape measured with current flowing perpendicular to its broad face. The measurements showed that the boundary superconductor/Ag has a resistive character. We have also found that in this experimental configuration the edges of the core connecting its upper and lower surface layer influence I–V curves in a decisive way. For the sample prepared from the original tape with an intact core and Ag edges, the shape of the I–V curves measured with perpendicular current was similar to those measured with current flowing parallel to the tape axis. The shape of the I–V curves for perpendicular current drastically changed if we interrupted the connections between the surface core layers by cutting off the core edges. The observed I–V curves exhibited two bends indicating the presence of two layers with two different critical current densities in the direction perpendicular to the broad face of the core. The higher Jc was 270 A cm−2 and the lower one was 150 A cm−2 (in zero external magnetic field at 77 K). Both Jc values were considerably lower than the value of Jc = 1 × 104 A cm−2 measured with current flowing parallel to the tape axis.",
author = "M. Polak and M. Majoros and Jaakko Paasi",
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doi = "10.1088/0953-2048/15/11/324",
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pages = "1628--1634",
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issn = "0953-2048",
publisher = "Institute of Physics IOP",
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Current-voltage curves and critical current densities of monocore Ag-clad (Bi,Pb)2Sr2Ca2Cu3O10+x tapes for currents applied perpendicular and parallel to the tape plane. / Polak, M.; Majoros, M.; Paasi, Jaakko.

In: Superconductor Science and Technology, Vol. 15, No. 11, 2002, p. 1628-1634.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Current-voltage curves and critical current densities of monocore Ag-clad (Bi,Pb)2Sr2Ca2Cu3O10+x tapes for currents applied perpendicular and parallel to the tape plane

AU - Polak, M.

AU - Majoros, M.

AU - Paasi, Jaakko

PY - 2002

Y1 - 2002

N2 - We analysed I–V curves of a monocore, Ag-clad (Bi, Pb)2Sr2Ca2Cu3O10+x tape measured with current flowing perpendicular to its broad face. The measurements showed that the boundary superconductor/Ag has a resistive character. We have also found that in this experimental configuration the edges of the core connecting its upper and lower surface layer influence I–V curves in a decisive way. For the sample prepared from the original tape with an intact core and Ag edges, the shape of the I–V curves measured with perpendicular current was similar to those measured with current flowing parallel to the tape axis. The shape of the I–V curves for perpendicular current drastically changed if we interrupted the connections between the surface core layers by cutting off the core edges. The observed I–V curves exhibited two bends indicating the presence of two layers with two different critical current densities in the direction perpendicular to the broad face of the core. The higher Jc was 270 A cm−2 and the lower one was 150 A cm−2 (in zero external magnetic field at 77 K). Both Jc values were considerably lower than the value of Jc = 1 × 104 A cm−2 measured with current flowing parallel to the tape axis.

AB - We analysed I–V curves of a monocore, Ag-clad (Bi, Pb)2Sr2Ca2Cu3O10+x tape measured with current flowing perpendicular to its broad face. The measurements showed that the boundary superconductor/Ag has a resistive character. We have also found that in this experimental configuration the edges of the core connecting its upper and lower surface layer influence I–V curves in a decisive way. For the sample prepared from the original tape with an intact core and Ag edges, the shape of the I–V curves measured with perpendicular current was similar to those measured with current flowing parallel to the tape axis. The shape of the I–V curves for perpendicular current drastically changed if we interrupted the connections between the surface core layers by cutting off the core edges. The observed I–V curves exhibited two bends indicating the presence of two layers with two different critical current densities in the direction perpendicular to the broad face of the core. The higher Jc was 270 A cm−2 and the lower one was 150 A cm−2 (in zero external magnetic field at 77 K). Both Jc values were considerably lower than the value of Jc = 1 × 104 A cm−2 measured with current flowing parallel to the tape axis.

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