Influence of Nd substitution on the superconducting properties of ceramics in the 2212 system Bi2−wPbwSr2−xCa1−yNdx+yCu2O8+z

Rentschler, T.; Kemmler‐Sack, S.; Hartmann, Michael; Hübener, Rainer; Kessler, P.; Lichte, Hannes

doi:10.1016/0921-4534(92)90379-q

Cited by 23 publications

(9 citation statements)

References 11 publications

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“…Also the Pb-substituted Bi-2212 [(Bi, Pb)-2212] has shown enhanced J C s in applied fields, compared to the Pb-free Bi-2212 [7]. Again a few studies reported that the flux pinning strength of (Bi, Pb)-2212 increases by rare-earth (RE) doping [8][9][10] and the flux pinning ability is usually determined from the values of flux pinning force density and activation energy [8,11,12]. Because the activation energy is the potential barrier height, it is the measure of flux pinning strength of the superconductor.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermo-magnetic fluctuations in Bi1.6Pb0.5Sr2−xLuxCa1.1Cu2.1O8+δ (0.000≤x≤0.125) superconductor

Vinu

Sarun

Shabna

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Analysis of thermo-magnetic fluctuations in Bi1.6Pb0.5Sr2−xLuxCa1.1Cu2.1O8+δ (0.000≤x≤0.125) superconductor

Vinu

Sarun

Shabna

et al. 2009

Journal of Alloys and Compounds

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“…In order to overcome these problems appeared, the flux pinning mechanism in the film should be investigated in detail. In the recent works [12][13][14][15][16][17][18][19][20][21][22][23][24], the researchers have extensively analyzed the flux pinning mechanism in the superconducting state to introduce the effective pinning centers such as planar defects, stacking faults, and microdefects, resulting in thermally activated jumps; or hopping of flux lines; or flux bundles over an energy barrier [25,26]. 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].…”

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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“…These inhomogeneities can improve T c and J c . Also, they can produce new effective flux pinning centers, which enhances J c in applied magnetic fields [1][2][3]. The substitutions by rare-earth (RE) at the Ca-site improve the superconducting properties for low substitution-content and deteriorate the superconductivity for higher substitution-content [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sm-substitution on the electrical and magnetic properties of (Tl0.8Hg0.2)-1223

Abou‐Aly¹,

Awad²,

Ibrahim³

et al. 2009

Journal of Alloys and Compounds

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Influence of Nd substitution on the superconducting properties of ceramics in the 2212 system Bi2−wPbwSr2−xCa1−yNdx+yCu2O8+z

Cited by 23 publications

References 11 publications

Analysis of thermo-magnetic fluctuations in Bi1.6Pb0.5Sr2−xLuxCa1.1Cu2.1O8+δ (0.000≤x≤0.125) superconductor

Analysis of thermo-magnetic fluctuations in Bi1.6Pb0.5Sr2−xLuxCa1.1Cu2.1O8+δ (0.000≤x≤0.125) superconductor

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

Effect of Sm-substitution on the electrical and magnetic properties of (Tl0.8Hg0.2)-1223

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