Thermally activated flux creep in the Bi1.66Pb0.34Sr2Ca2−xMgxCu3Oy superconductors

Kameli, P.; Salamati, H.; Abdolhosseini, I.; Sohrabi, D.

doi:10.1016/j.physc.2007.10.015

Cited by 16 publications

(7 citation statements)

References 17 publications

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“…5, the flux pinning energy decreases as the magnetic field strength increases, which is in agreement with others [6,12,13,36]. The main differences between curves were observed for fields below 0.5 Tesla.…”

Section: Resultssupporting

confidence: 91%

“…The systematic study of influence of an external magnetic field on the resistive transition has been extensively investigated for many years [1][2][3][4][5][6][7][8][9][10][11][12][13]. It has been experimentally shown that the resistive transitions of all HTSC broaden in applied magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the high-T c granular superconductors such as (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O y generally show a two step resistive transition and a tail in the lower temperature side [12,[26][27][28][29][30]. The peak temperature corresponds to the superconducting transition within the grains and the tail is related to the intergranular coupling.…”

Section: Introductionmentioning

confidence: 99%

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Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

Yazici

Erdem

Özçelık

2012

J Supercond Nov Magn

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In the present work, Bi-Pb-V-Sr-Ca-Cu-Ti-O bulk samples with nominal composition (BiPb) 2 V x Sr 2 Ca 3 Cu 4−y Ti y O 12+δ with x = 0.2 and y = 0.1, 0.2 and 0.3 compounds have been prepared by the melt-quenching method. The magnetoresistance of the samples has been measured for different values of the applied magnetic field. Using the resistivity data, the upper critical magnetic field H c2 (0) at T = 0 K was calculated. The coherence lengths at T = 0 K were calculated from H c2 (0) values. The thermally activated flux creep model has been studied in order to calculate the flux pinning energies. The results showed that H c2 (0) varied from 152.5 to 60.4 T and the flux pinning energies varied from 515 to 184 meV at 0 T, with the content y.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

Yazici

Erdem

Özçelık

2012

J Supercond Nov Magn

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“…The superconducting transition temperature T c , which displays the superconducting transition within the grains, is determined as the temperature corresponding to the crest in dρ/dT versus T curve [54]. The inset in Fig.…”

Section: Characterization and Investigationmentioning

confidence: 99%

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

et al. 2016

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Abstract:The effect of the partial substitution of Ca 2+ by Ho 3+ ions on the electrical and mechanical properties of the superconducting phase (Bi,Pb)-2223 was studied. Superconducting samples of the type (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ were prepared by solid-state reaction technique under ambient pressure, and characterized by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The superconducting transition temperature T c and pseudogap temperature T * were estimated from electrical resistivity measurements, while the critical current density J c was determined from I-V curves. The electrical resistivity data were discussed according to bipolaron model in the absence of thermally excited individual polarons. The sample with x = 0.025 showed the highest phase volume fraction, T c , and J c . Room temperature Vickers microhardness measurements were carried out at different applied loads (0.25-5 N) in order to investigate the performance of the mechanical properties of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ phase. It was found that all the samples exhibit normal indentation size effect (ISE). The Vickers microhardness number H V increased as x increased from 0 to 0.025. The experimental results were discussed in view of Meyer's law, Hays-Kendall (HK) approach, elastic/plastic deformation (EPD) model, and proportional specimen resistance (PSR) model. The load independent (true) microhardness of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ superconducting samples showed identical behavior to that of the PSR model.

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“…Similar results were obtained by other research groups. [20][21][22][23] The temperature dependence of the calculated upper critical field (H c2 ) values for the Tl-2212 sample is plotted in Figure 4. It was found that H c2 (T) values increased with decreasing temperature.…”

Section: Effect Of DC Magnetic Field Resultsmentioning

confidence: 99%

Influence of KMnO4 Substitution on the Structural and Transport Properties of Tl2Ba2Ca(Cu1-xRx)2Oδ+6 System

Hassan¹,

Alnakhlani²,

Abdulhafiz³

et al. 2016

JPS

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Thermally activated flux creep in the Bi1.66Pb0.34Sr2Ca2−xMgxCu3Oy superconductors

Cited by 16 publications

References 17 publications

Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

Effect of High Valancy Cations on the Intergranular Pinning Energies of (Bi-Pb)2Sr2Ca2Cu3O10+δ Samples

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Influence of KMnO4 Substitution on the Structural and Transport Properties of Tl2Ba2Ca(Cu1-xRx)2Oδ+6 System

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