Pinning strength in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconductor tapes studied from current-electric field characteristics

Lau, Kok-Tee; Abd‐Shukor, R.

doi:10.1007/s10854-005-4952-y

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…A carefully controlled introduction of suitable impurities will lead to significant flux pinning effects. From the previous studies, addition of nanoparticles into HTS was found to enhance the J c of the superconductors [10][11][12][13][14][15]. For thallium-based superconductors, most of the studies focused on the transport current enhancement of by element substitutions [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phase Formation and Electrical Transport Properties of Nano-Sized SnO2 Added (Tl0.85Cr0.15)Sr2CaCu2O7-δ Superconductors

Kong

Kechik

et al. 2017

SSP

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In this work, the effect of nano-sized SnO2 addition on the phase formation and electrical transport properties of (Tl0.85Cr0.15)Sr2CaCu2O7-δ (Tl-1212) superconductor was investigated. Thallium-based high temperature superconductor (HTS) with nominal starting composition (Tl0.85Cr0.15) Sr2CaCu2O7-δ was prepared using high purity oxide powders via solid state reaction method. Nano-sized SnO2 with 0.01 – 0.05 wt.% were added into Tl-1212 superconductors. The characteristic of the samples were determined by powder X-ray diffraction method (XRD), scanning electron microscopy (SEM), energy dispersive X-Ray analysis (EDX), electrical resistance measurements and transport critical current density measurements. Nano-sized SnO2 added (Tl0.85Cr0.15)Sr2CaCu2O7-δ showed Tc-zero between 93 and 95 K. All of the samples indicated a dominant phase of Tl-1212 with a minor phase of Tl-1201. The highest Jc (at 77 K) was shown by sample with 0.03 wt.% at 3260 mA/cm2. SnO2 has significantly enhanced the transport critical current density of Tl-1212 superconductor by acting as flux pinning centers. However, further addition of nano-sized SnO2 in Tl-1212 superconductor caused degradation in Jc. The SEM micrographs with energy dispersive X-Ray analysis (EDX) showed that SnO2 were well distributed in all the samples.

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Section: Introductionmentioning

confidence: 99%

Phase Formation and Electrical Transport Properties of Nano-Sized SnO2 Added (Tl0.85Cr0.15)Sr2CaCu2O7-δ Superconductors

Kong

Kechik

et al. 2017

SSP

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Enhanced flux pinning in Ag-sheathed Bi(Pb)–Sr–Ca–Cu–O superconductors tapes with addition of magnetic nanorod γ-Fe2O3

Lau

Yahya

Abd‐Shukor

2006

Journal of Applied Physics

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The pinning strength of the Ag-sheathed Bi(Pb)–Sr–Ca–Cu–O tapes with the addition of magnetic nanorod γ-Fe2O3 is studied using the exponent n values obtained from power law current-electric field (I-E) characteristics. The starting composition of the γ-Fe2O3 added samples is Bi1.6Pb0.4Sr2Ca2Cu3O10-(γ-Fe2O3)0.01. The rate of decrease of n values in applied fields for the tapes with nano-γ-Fe2O3 is found lower than the tapes without nano-γ-Fe2O3. This indicates that the pinning strength for the tapes with nano γ-Fe2O3 is relatively higher than the tapes prepared without nano γ-Fe2O3. The results are supported by two conventional methods which are normally used to compare the pinning strength of superconductor tapes. Magnetic impurities generally suppress superconductivity. However, our study shows that magnetic nanorod γ-Fe2O3 enhanced the pinning strength of Ag-sheathed Bi–Sr–Ca–Cu–O superconductor tapes. This is consistent with previous calculations on frozen flux superconductor with magnetic nanorod as pinning centers.

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Pinning strength in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconductor tapes studied from current-electric field characteristics

Cited by 2 publications

References 9 publications

Phase Formation and Electrical Transport Properties of Nano-Sized SnO<sub>2</sub> Added (Tl<sub>0.85</sub>Cr<sub>0.15</sub>)Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>7-δ </sub>Superconductors

Phase Formation and Electrical Transport Properties of Nano-Sized SnO<sub>2</sub> Added (Tl<sub>0.85</sub>Cr<sub>0.15</sub>)Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>7-δ </sub>Superconductors

Enhanced flux pinning in Ag-sheathed Bi(Pb)–Sr–Ca–Cu–O superconductors tapes with addition of magnetic nanorod γ-Fe2O3

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