Analysis of transport critical current density in a bent BiPbSrCaCuO silver-sheathed tape

W. D. Lee, Lance Horng, T. J. Yang, B. S. Chiou

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The experimental results on the magnetic behavior of the transport critical current density in a bent Bi based superconducting tape have shown that the irreversible strain limit εirrev for the onset of permanent strain damage to Ag sheathed superconductors is not dependent on the magnetic field, nor does the normalized Ic(H, ε) Ic(0, ε) current depend on the strain at least up to 0.5 T at 77 K. Such a behavior has been attributed to two reasons: (1) The intrinsic pinning properties are unchanged in a bent tape; (2) The strain effect is extrinsic and arises from superconductor cracks. Thus, based on these arguments a Josephson junction tunneling model with cracks in between the grain boundaries is proposed to explain the Jc behavior quite well for a bent granular high-Tc superconducting tape. Our model calculation shows that the critical current density of high-Tc superconductor may be enhanced by increasing the strain tolerance εirrev and the εirrev is determined by the properties of Ag sheathed tape and its related material parameters, which are dependent on the connectivity of the grain boundaries.

Original languageEnglish
Pages (from-to)215-220
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume247
Issue number3-4
DOIs
Publication statusPublished - 1995 Jun 1

Fingerprint

Silver
Tapes
tapes
critical current
silver
current density
Superconducting tapes
Superconducting materials
cracks
grain boundaries
Grain boundaries
Critical current density (superconductivity)
Cracks
Josephson junctions
damage
Magnetic fields
magnetic fields

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

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abstract = "The experimental results on the magnetic behavior of the transport critical current density in a bent Bi based superconducting tape have shown that the irreversible strain limit εirrev for the onset of permanent strain damage to Ag sheathed superconductors is not dependent on the magnetic field, nor does the normalized Ic(H, ε) Ic(0, ε) current depend on the strain at least up to 0.5 T at 77 K. Such a behavior has been attributed to two reasons: (1) The intrinsic pinning properties are unchanged in a bent tape; (2) The strain effect is extrinsic and arises from superconductor cracks. Thus, based on these arguments a Josephson junction tunneling model with cracks in between the grain boundaries is proposed to explain the Jc behavior quite well for a bent granular high-Tc superconducting tape. Our model calculation shows that the critical current density of high-Tc superconductor may be enhanced by increasing the strain tolerance εirrev and the εirrev is determined by the properties of Ag sheathed tape and its related material parameters, which are dependent on the connectivity of the grain boundaries.",
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Analysis of transport critical current density in a bent BiPbSrCaCuO silver-sheathed tape. / Lee, W. D.; Horng, Lance; Yang, T. J.; Chiou, B. S.

In: Physica C: Superconductivity and its applications, Vol. 247, No. 3-4, 01.06.1995, p. 215-220.

Research output: Contribution to journalArticle

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AU - Horng, Lance

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AB - The experimental results on the magnetic behavior of the transport critical current density in a bent Bi based superconducting tape have shown that the irreversible strain limit εirrev for the onset of permanent strain damage to Ag sheathed superconductors is not dependent on the magnetic field, nor does the normalized Ic(H, ε) Ic(0, ε) current depend on the strain at least up to 0.5 T at 77 K. Such a behavior has been attributed to two reasons: (1) The intrinsic pinning properties are unchanged in a bent tape; (2) The strain effect is extrinsic and arises from superconductor cracks. Thus, based on these arguments a Josephson junction tunneling model with cracks in between the grain boundaries is proposed to explain the Jc behavior quite well for a bent granular high-Tc superconducting tape. Our model calculation shows that the critical current density of high-Tc superconductor may be enhanced by increasing the strain tolerance εirrev and the εirrev is determined by the properties of Ag sheathed tape and its related material parameters, which are dependent on the connectivity of the grain boundaries.

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