Enhanced flux pinning in (Bi,Pb)-2223/Ag tapes by slight Ni doping

Ma, Ruifang; Song, Wenhai; Zhu, Xuebin; Zhang, L.; Liu, S.M.; Fang, Jingzhong; Du, Junjie; Sun, Yipeng; Li, C.S.; Yu, Z.M.; Feng, Yang; Zhang, P.X.

doi:10.1016/j.physc.2004.01.013

Cited by 26 publications

(11 citation statements)

References 32 publications

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“…This is an improvement by about 40% compared to the sample without particle addition. For both samples, the large curves obtained indicate that the pinning properties cannot be explained by only one pinning mechanism over the whole region of the F p (h) curves, which implies that more than one type of pinning source may be present at the same time [4,5,20,29,31]. A fitting procedure using the Dew-Hughes expression (II) was performed for different samples.…”

Section: Pinning Mechanismmentioning

confidence: 99%

“…The improvement of J c and its behavior under a magnetic field J c (H) can be obtained by introducing efficient pinning centers with a size (matching the coherence length) that can suppress the flux flow. Various methods have been used to introduce effective artificial pinning centers and to increase their number [1][2][3][4][5][6][7][8][9][10][11][12][13]. Precipitates dispersed into the superconducting matrix are often found to be an effective pinning source.…”

Section: Introductionmentioning

confidence: 99%

“…F p is mainly depend on the pinning center size, which determines the total length of interacting fluxlines, and the geometrical nature of the interaction. There are some reports [4,5,20] on the effect of substitution of some sites in (Bi,Pb)-2223 on the pinning mechanism. Indeed, the substitution by Pr on the Ca sites and Cr or Ni on the Cu sites at low levels of doping was also reported to increase the critical current in (Bi,Pb)-2223/Ag tapes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

Ghattas¹,

Annabi²,

Zouaoui³

et al. 2008

Physica C: Superconductivity and its Applications

107

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Section: Pinning Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

Ghattas¹,

Annabi²,

Zouaoui³

et al. 2008

Physica C: Superconductivity and its Applications

107

View full text Add to dashboard Cite

“…Over the pinning energy barrier of a structure, the flux line might be thermally activated although the Lorentz force exerted on the flux bundle by the current is smaller than the pinning force [27][28][29][30]. A model, described as thermally activated flux flow (TAFF), works well in the resistivity region near T c as a result of the zero resistivity (ρ = 0) [31][32][33][34]. Additionally, the width of the superconducting transition depends strongly on the anisotropy associated with the magnetic field direction with regard to the Cu-O planes (the c-axis) in the structure [35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Field Direction on Magnetoresistivity, Activation Energy, Irreversibility and Upper Critical Field of Bi-2212 Thin Film Fabricated by DC Sputtering Method

Bal

Varılcı

2012

J Supercond Nov Magn

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This study aims to investigate the effect of magnetic field direction on superconducting properties of Bi-2212 thin film fabricated on MgO (100) substrate using the direct current (DC) magnetron reactive sputtering technique at 100 watt with the aid of magnetoresistivity measurements. The zero resistivity transition temperatures (T c ), irreversibility fields (μ 0 H irr ) and upper critical fields (μ 0 H c2 ) are deduced from the magnetoresistivity versus temperature curves under DC magnetic fields (parallel and perpendicular to c-axis) up to 5 T. Moreover, thermally activated flux flow (TAFF) model is studied for activation energy (U 0 ) values of the sample. It is found that the T c value decreases from 76.4 K to 39.1 K for the applied magnetic field perpendicular to c-axis (μ 0 H ⊥c-axis); likewise, the T c reduces towards 28.8 K with the increase in the applied field parallel to c-axis (μ 0 H c-axis). Furthermore, the U 0 values are found to decrease considerably with increasing applied magnetic field. In fact, the U 0 of 134.5 K is obtained to be smallest at 5 T field parallel to the c-axis. Additionally, both the μ 0 H irr and μ 0 H c2 values determined are also observed to reduce with the increase of the applied magnetic field. At absolute zero temperature (T = 0 K), the extrapolation of the μ 0 H irr (T ) and μ 0 H c2 (T ) curves is used to obtain the μ 0 H irr (0) and μ 0 H c2 (0) values of the film, respectively. The inner is found to be about 22.216 T (19.046 T) for the applied field perpendicular (parallel) to c-axis whereas the latter is determined to be about 54.095 T (126.522 T) for the applied field parallel (perpendicular) to c-axis, respectively, as a result of anisotropic behavior of the film prepared. On the other hand, penetration depths (λ) and coherence lengths (ξ ) inferred from μ 0 H irr (0) and μ 0 H c2 (0) values are obtained to be about 38.519 Å (41.601 Å) and 16.147 Å (24.685 Å) in the case of applied field perpendicular (parallel) to c-axis, respectively. Based on all the results, the change of the superconducting properties as a function of the magnetic field direction presents the anisotropy of the sample produced. X-ray diffraction (XRD) and scanning electron microscopy (SEM) examinations are also conducted for microstructural and phase analyses of the film.

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“…However, their electrical transport properties drawback with increasing sample temperature and applied magnetic due to their low flux pinning energy. One of the possible solutions to enhance the flux pinning properties of HTc superconductors is by chemical doping and addition of nanosized particles [1][2][3][4]. Chemical dopants and preparation method play an important role on the microstructure and electrical properties of the superconducting material.…”

Section: Introductionmentioning

confidence: 99%

Pinning mechanism in (Bi,Pb)-2223 polycrystalline samples prepared with Al₂O₃nano-particles

Ghattas¹,

Azzouz²,

Annabi³

et al. 2008

J. Phys.: Conf. Ser.

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Enhanced flux pinning in (Bi,Pb)-2223/Ag tapes by slight Ni doping

Cited by 26 publications

References 32 publications

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

Effect of Magnetic Field Direction on Magnetoresistivity, Activation Energy, Irreversibility and Upper Critical Field of Bi-2212 Thin Film Fabricated by DC Sputtering Method

Pinning mechanism in (Bi,Pb)-2223 polycrystalline samples prepared with Al₂O₃nano-particles

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Enhanced flux pinning in (Bi,Pb)-2223/Ag tapes by slight Ni doping

Cited by 26 publications

References 32 publications

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

Effect of Magnetic Field Direction on Magnetoresistivity, Activation Energy, Irreversibility and Upper Critical Field of Bi-2212 Thin Film Fabricated by DC Sputtering Method

Pinning mechanism in (Bi,Pb)-2223 polycrystalline samples prepared with Al2O3nano-particles

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Pinning mechanism in (Bi,Pb)-2223 polycrystalline samples prepared with Al₂O₃nano-particles