Influences of Cracking of Coated Layer on Critical Current in Coated Composite Superconductor

Influences of cracking of the coated DyBa2Cu3Ȯ˽δ˰superconducting layer in composite superconductor under applied tensile strain on V(voltage)-I(current) curve, critical current and n-value were studied experimentally and analytically. The measured variations of V-I curve and critical current with increasing applied strain were described well by the modeling analysis. Also, the variations of shunting current with increasing imposed current and also with extension of cracks were revealed, from which the influences of shunting current on the variation of n-value with current were elucidated.

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Influences of cracking of coated superconducting layer on voltage-current curve, critical current, and n-value in DyBCO-coated conductor pulled in tension

Journal of Applied Physics ◽

10.1063/1.3488014 ◽

2010 ◽

Vol 108 (6) ◽

pp. 063905 ◽

Cited By ~ 26

Author(s):

S. Ochiai ◽

T. Arai ◽

A. Toda ◽

H. Okuda ◽

M. Sugano ◽

...

Keyword(s):

Critical Current ◽

Coated Conductor ◽

Superconducting Layer ◽

N Value ◽

Current Curve

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Effects of Heterogeneous Cracking of Superconducting Layer on Voltage-Current Curve, Critical Current, and n-Value in High-Temperature Superconducting Layer-Coated Conductor Tape

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.mbw201401 ◽

2015 ◽

Vol 56 (3) ◽

pp. 381-388 ◽

Cited By ~ 4

Author(s):

Shojiro Ochiai ◽

Hiroshi Okuda ◽

Noriyuki Fujii ◽

Kozo Osamura

Keyword(s):

High Temperature ◽

Critical Current ◽

Coated Conductor ◽

Superconducting Layer ◽

High Temperature Superconducting ◽

Current Curve

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Modeling analysis of distribution of irreversible bending strain for critical current in Bi2223-composite tape

Physica C Superconductivity ◽

10.1016/j.physc.2008.05.087 ◽

2008 ◽

Vol 468 (15-20) ◽

pp. 1796-1800 ◽

Cited By ~ 4

Author(s):

S. Ochiai ◽

J.K. Shin ◽

Y. Mukai ◽

H. Matsubayashi ◽

H. Okuda ◽

...

Keyword(s):

Critical Current ◽

Composite Tape ◽

Bending Strain ◽

Modeling Analysis

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Effect of mechanical grinding on the transport critical current density and the flux pinning force of a YBa2Cu3OyAg composite superconductor

Journal of Alloys and Compounds ◽

10.1016/0925-8388(95)02146-9 ◽

1996 ◽

Vol 236 (1-2) ◽

pp. 165-170 ◽

Cited By ~ 2

Author(s):

Shigeru Katsuyama ◽

Yoshinao Harada ◽

Toshiyuki Tatani ◽

Yoshinori Ozawa ◽

Kazuhiko Majima ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Flux Pinning ◽

Transport Critical Current Density ◽

Pinning Force ◽

Mechanical Grinding ◽

Composite Superconductor ◽

Flux Pinning Force

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FROZEN FLUX SUPERCONDUCTORS

Modern Physics Letters B ◽

10.1142/s0217984999000622 ◽

1999 ◽

Vol 13 (15) ◽

pp. 491-497 ◽

Cited By ~ 70

Author(s):

I. F. LYUKSYUTOV ◽

D. G. NAUGLE

Keyword(s):

Magnetic Nanoparticles ◽

Critical Current ◽

Flux Line ◽

Magnetic Nanorods ◽

Novel Materials ◽

New Class ◽

Columnar Defects ◽

Composite Superconductor ◽

Composite Superconductors ◽

Line Network

We propose a new class of composite superconductors with embedded magnetic nanoparticles/nanorods. These nanomagnets can create a thermodynamically stable, frozen, dense flux line network. We discuss the methods of fabrication of these novel materials. We show that due to the frozen flux created by magnetic nanorods, the critical current in this composite superconductor can be higher than in the superconductor with a comparable density of columnar defects.

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Influence of Applied Tensile and Bending Strains on Local and Overall Critical Current of Multifilamentary Bi2223-Composite Superconductor

THERMEC 2006 - Materials Science Forum ◽

10.4028/0-87849-428-6.739 ◽

2007 ◽

pp. 739-744

Author(s):

Shojiro Ochiai ◽

D. Doko ◽

Hiroshi Okuda ◽

Sang Soo Oh ◽

Dong Woo Ha ◽

...

Keyword(s):

Critical Current ◽

Composite Superconductor

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Influences of Electroplated Copper on Tensile Strain and Stress Tolerance of Critical Current in DyBCO-Coated Conductor

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2011.2165844 ◽

2012 ◽

Vol 22 (1) ◽

pp. 8400607-8400607 ◽

Cited By ~ 8

Author(s):

S. Ochiai ◽

H. Okuda ◽

M. Sugano ◽

K. Osamura ◽

W. Prusseit

Keyword(s):

Stress Tolerance ◽

Critical Current ◽

Tensile Strain ◽

Coated Conductor ◽

Electroplated Copper

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Influence of Applied Tensile and Bending Strains on Local and Overall Critical Current of Multifilamentary Bi2223-Composite Superconductor

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.739 ◽

2007 ◽

Vol 539-543 ◽

pp. 739-744

Author(s):

Shojiro Ochiai ◽

D. Doko ◽

Hiroshi Okuda ◽

Sang Soo Oh ◽

Dong Woo Ha ◽

...

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Distribution Function ◽

Weibull Distribution ◽

Critical Current ◽

Experimental Result ◽

N Value ◽

Local Current ◽

Composite Superconductor ◽

Extent Of Damage

Influence of applied tensile and bending strains on the local and overall transport critical current Ic and n-value at 77 K of multifilamentary Bi2223-composite superconductor was studied, where the n-value refers to the sharpness of the transition from super- to normal conducting state. Under both tensile and bending strains, the damage such as transverse and longitudinal cracking of the Bi2223 filaments and interfacial debonding between the filament and silver progressed. The extent of damage and accordingly the critical current was different among the local portions. The relation of the local current and n-value to overall ones was analyzed with a voltage summation model, with which the experimental result was described well. Further analysis revealed that the distribution of local critical current could be described by the Weibull distribution function and n-value could be expressed as a function of critical current. Based on these results, a Monte Carlo simulation was carried out to predict the overall critical current from the distribution of local critical current, with which the experimental results could be described.

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