Anomalous magnetization in a heavily Pb-doped Bi2Sr2CaCu2O8+δ as-grown single crystal

Sun, Yipeng; Song, Wenhai; Du, Juan; Ku, H. C.

doi:10.1016/s0921-4534(02)02106-8

Cited by 4 publications

(5 citation statements)

References 34 publications

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“…Symmetric M(H) indicates a strong bulk pinning and no significant influence of surface barrier. [35][36][37] These results are in accordance with findings on the films in general.…”

Section: Magnetic Properties and Critical Current Density J Csupporting

confidence: 91%

Effect of Bi deficiency on grain alignment of BiPb-2223 thin film fabricated using rf sputtering process and on critical current density properties

Aksan

Altın

Yakıncı

et al. 2011

Materials Science and Technology

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In the present study, thin films prepared as a function of the Bi concentration in the BiPbSrCaCuO system were synthesised. Thin films were fabricated using radio frequency sputtering method. Crystal structure of the films fabricated was determined from X-ray diffraction measurements. The crystal orientation was analysed by X-ray pole figure and in-plane alignment. Both X-ray diffraction and pole figure analysis revealed that crystallinity in the films decreased significantly with decreasing Bi concentration in the system. A systematic decrease in the superconducting transition temperature and hole concentration per CuO plane was obtained with decreasing Bi concentration. The Jc values of the films were calculated using Bean formula. It exhibits a significant dependence on the magnetic field and temperature. It was found that Jc decreased sharply with increasing applied magnetic field. The highest Jc value was found to be 1·06×106 A cm−2 at 10 K, which corresponded to the best flux pinning among the films fabricated.

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“…Symmetric M(H) indicates a strong bulk pinning and no significant influence of surface barrier. [35][36][37] These results are in accordance with findings on the films in general.…”

Section: Magnetic Properties and Critical Current Density J Csupporting

confidence: 91%

Effect of Bi deficiency on grain alignment of BiPb-2223 thin film fabricated using rf sputtering process and on critical current density properties

Aksan

Altın

Yakıncı

et al. 2011

Materials Science and Technology

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“…The discussed analysis has been tested also on some experimental data of three different iron based and one cuprate superconductors available in literature 19 , 20 , 25 , 56 , since in those cases all the necessary S(H) values (at low, intermediate and high fields) for the analysis were reported. The data have been extracted from the plots reported in the papers by means of a specific digitization software 71 and the same kind of fits, discussed in this work, have been applied (see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…3 applied to the S as a function of H curves of different samples. Data have been taken from literature, in particular from 56 (for the panel (a)), 20 (for the panel (b)), 19 (for the panel (c)), and 25 (for the panel (d)). …”

Section: Resultsmentioning

confidence: 99%

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A precursor mechanism triggering the second magnetization peak phenomenon in superconducting materials

Polichetti

Galluzzi

Buchkov

et al. 2021

Sci Rep

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The correlation in type-II superconductors between the creep rate S and the Second Magnetization Peak (SMP) phenomenon which produces an increase in Jc, as a function of the field (H), has been investigated at different temperatures by starting from the minimum in S(H) and the onset of the SMP phenomenon detected on a FeSe0.5Te0.5 sample. Then the analysis has been extended by considering the entire S(H) curves and comparing our results with those of many other superconducting materials reported in literature. In this way, we find evidence that the flux dynamic mechanisms behind the appearance of the SMP phenomenon in Jc(H) are activated at fields well below those where the critical current starts effectively to increase. Moreover, the found universal relation between the minimum in the S(H) and the SMP phenomenon in Jc(H) shows that both can be attributed to a sequential crossover between a less effective pinning (losing its effectiveness at low fields) to a more effective pinning (still acting at high fields), regardless of the type-II superconductor taken into consideration.

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“…A strong fishtail effect associated with surface pinning in spiral-grown Bi-2212 crystals was observed when using alkaline chloride as flux [14][15][16]. Also, synthesis of Bi-2212 under heavy Pb-doping [17,18] or processing of Bi-2223 by the phase formation-decomposition-recovery (PFDR) route [14,19,20], both accompanied by an increased amount of liquid phase, were reported as developing strong pinning sites and/or anomalous magnetic effects.…”

Section: Discussionmentioning

confidence: 99%

Anomalies of AC susceptibility losses in the doped [Bi(Pb)]₂Sr₂Ca₂Cu₃O_xsuperconductor

Mihalache

Aldica

Badica

et al. 2004

Supercond. Sci. Technol.

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AC susceptibility measurements have been performed on Bi1.7Pb0.4Sr1.5Ca2.5Cu3.6Ox (Bi-2223) samples doped with different Li-based compounds and prepared by the solid-state method. As-prepared samples and/or samples annealed in oxygen or argon, ground or unground, have been investigated in detail in order to understand the occurrence, nature and evolution of the anomalous peaks observed in curves versus the measuring parameters; we have detected up to four peaks instead of the usual two peaks observed in the non-doped samples. It was found that intrinsic physical–chemical properties, such as the melting temperature of the doping compound, are no less important for the final properties of the superconductor than their insertion properties into the crystal lattice of Bi-2223. Doping compounds with melting temperatures below or close to the phase formation temperature of the Bi-2223 phase can act as flux, changing the growth conditions. Intensification of some processes against others (e.g. decomposition–recovery of the Bi-2223 phase, solubilization–precipitation of the secondary phases, changes in the properties of the liquid phase, etc) can lead to the formation of the Bi-2223 phase with different properties than for the non-doped superconductor. Generally, when using flux-type doping compounds, anomalous AC losses peaks are detected and the intra-granular critical current density is enhanced.

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Anomalous magnetization in a heavily Pb-doped Bi2Sr2CaCu2O8+δ as-grown single crystal

Cited by 4 publications

References 34 publications

Effect of Bi deficiency on grain alignment of BiPb-2223 thin film fabricated using rf sputtering process and on critical current density properties

Effect of Bi deficiency on grain alignment of BiPb-2223 thin film fabricated using rf sputtering process and on critical current density properties

A precursor mechanism triggering the second magnetization peak phenomenon in superconducting materials

Anomalies of AC susceptibility losses in the doped [Bi(Pb)]₂Sr₂Ca₂Cu₃O_xsuperconductor

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Anomalous magnetization in a heavily Pb-doped Bi2Sr2CaCu2O8+δ as-grown single crystal

Cited by 4 publications

References 34 publications

Effect of Bi deficiency on grain alignment of BiPb-2223 thin film fabricated using rf sputtering process and on critical current density properties

Effect of Bi deficiency on grain alignment of BiPb-2223 thin film fabricated using rf sputtering process and on critical current density properties

A precursor mechanism triggering the second magnetization peak phenomenon in superconducting materials

Anomalies of AC susceptibility losses in the doped [Bi(Pb)]2Sr2Ca2Cu3Oxsuperconductor

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Anomalies of AC susceptibility losses in the doped [Bi(Pb)]₂Sr₂Ca₂Cu₃O_xsuperconductor