Numerical simulations on the role of the defect size on the critical current in high-temperature superconductors

Khawaja, U. Al; Benkraouda, Maamar; Kim, Hee-Je; Alneaimi, S.

doi:10.1016/j.physc.2006.03.134

Cited by 32 publications

(12 citation statements)

References 36 publications

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“…Nanoparticles with size larger than the coherence length, n, and smaller than penetration depth, k, have been suggested to increase J c [7]. However, other studies showed that the optimum size of pinning centers should be comparable to k rather than n [8].…”

Section: Introductionmentioning

confidence: 99%

Transport critical current density of (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag superconductor tapes with addition of nanosized CoFe2O4

Hafiz

Abd‐Shukor

2015

Appl. Phys. A

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The effect of nanosized CoFe 2 O 4 (60 nm) addition on the transport critical current density, J c , of (Bi 1.6 Pb 0.4 )Sr 2 Ca 2 Cu 3 O 10 (CoFe 2 O 4 ) x (x = 0-0.05 wt%) superconductor prepared by the co-precipitation method was investigated. The optimal J c (measured using the fourpoint probe method) was observed in the x = 0.01 wt% pellets. Using this optimal wt%, Ag-sheathed (Bi 1.6 Pb 0.4 )-Sr 2 Ca 2 Cu3O 10 (CoFe 2 O 4 ) 0.01 superconductor tapes were fabricated using the powder-in-tube method. The tapes were sintered for 50 and 100 h at 845°C. The phase and microstructure of the samples were determined using the powder X-ray diffraction method and scanning electron microscopy, respectively. The temperature dependence of J c for the tapes in various applied magnetic fields was also measured.

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Section: Introductionmentioning

confidence: 99%

Transport critical current density of (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag superconductor tapes with addition of nanosized CoFe2O4

Hafiz

Abd‐Shukor

2015

Appl. Phys. A

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“…A strong interaction between flux line network and the system can be expected if ξ < L < λ where is L the average nanoparticle size [9]. Addition of the nanoparticles within this size range will increase the critical current density [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of nanosized Co0.5Ni0.5Fe2O4 on the transport critical current density of Bi1.6Pb0.4Sr2Ca2Cu3O10 superconductor

Hafiz¹,

Abd‐Shukor²

2014

AIP Conference Proceedings

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Abstract. The effects of nano-sized Co 0.5 Ni 0.5 Fe 2 O 4 addition on the superconducting and transport properties of Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 10 (Bi-2223) in bulk form has been investigated. Bi-2223 superconductor was fabricated using coprecipitation method and 0.01 -0.05 wt% of Co 0.5 Ni 0.5 Fe 2 O 4 nanoparticles with average size of 20 nm were added into the samples. The critical temperature (T c ) and critical current density (J c ) of the samples were measured by using the four-point probe method, while the phase formation and microstructure of the samples were examined using x-ray diffraction and SEM respectively. It was found that J c of all samples added with Co 0.5 Ni 0.5 Fe 2 O 4 were higher than nonadded sample, with x = 0.01 wt. % sample showing the highest J c . This study showed that small addition of nanoCo 0.5 Ni 0.5 Fe 2 O 4 can effectively enhance the transport critical current density in Bi-2223 superconductor.

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“…16 An increase in the critical current density is expected when the size of the pinning center is larger than the coherence length, . 17 The coherence length of the YBa 2 Cu 3 O 7 system is between 0.2 and 3 nm, and the penetration depth, is about 140 nm. 18 For magnetic particles with characteristic length L where < L < , strong interaction between flux line network and magnetic system can be expected.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano-sized Co3O4 addition on the transport properties of YBa2Cu3O7−δ

Abd‐Shukor¹,

Nazrin

Aisyah

et al. 2014

AIP Conference Proceedings

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Abstract. The effect of nano-sized Co 3 O 4 (10 -30 nm) addition on YBa 2 Cu 3 O 7-(Co 3 O 4 ) x with x = 0 to 0.12 wt.% has been investigated by powder X-ray diffraction method, dc electrical resistance measurements and scanning electron microscopy. The Co 3 O 4 particle size was larger than the coherence length but smaller than the penetration depth of the YBa 2 Cu 3 O 7-superconductor. The onset transition temperature (T c onset ) showed no significant changes for low Co 3 O 4 addition (x 0.02 wt. %) and then decreased monotonically with the increase in Co 3 O 4 content indicating a pair-breaking like mechanism in T c suppression for x = 0.03 to 0.12 wt. %. A sudden broadening of the superconducting-transitionwidth for x 0.11 wt. % was also observed. The transport properties were measured and related to the microstructure. Scanning electron micrographs showed homogeneous distribution of Co 3 O 4 throughout the samples and the distance between particles was smaller than 1 μm but larger than the typical Abrikosov vortex lattice constant.

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Numerical simulations on the role of the defect size on the critical current in high-temperature superconductors

Cited by 32 publications

References 36 publications

Transport critical current density of (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag superconductor tapes with addition of nanosized CoFe2O4

Transport critical current density of (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag superconductor tapes with addition of nanosized CoFe2O4

Effect of nanosized Co0.5Ni0.5Fe2O4 on the transport critical current density of Bi1.6Pb0.4Sr2Ca2Cu3O10 superconductor

Effect of nano-sized Co3O4 addition on the transport properties of YBa2Cu3O7−δ

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