Dissipation mechanism in a high-Tc Bi1.7Pb0.3Sr2Ca2Cu3Ox granular superconductor

Bhalla, Gaurav; Pratima, .; Malik, Amita; Singh, K. K.

doi:10.1016/s0921-4534(03)00805-0

Cited by 29 publications

(13 citation statements)

References 42 publications

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“…The observed deviation of the data U (T ) from the derived (1 − T /T p ) m curves for a temperature noted T Bp up to temperature T p , may originate from a different dissipative process. This transition temperature T Bp was observed by Bhalla et al [17] in the granular Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O x superconductors. Above the crossover T Bp temperature the order parameter fluctuation seems to dominate the cause of dissipation phenomena and below T Bp the vortex dynamics seems to dominate the cause of dissipation.…”

Section: Resultssupporting

confidence: 76%

Effect of nano-size ZrO₂addition on the flux pinning properties of (Bi, Pb)-2223 superconductor

Zouaoui¹,

Ghattas²,

Annabi³

et al. 2008

Supercond. Sci. Technol.

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We investigated the microstructure and flux pinning capability of the bulk (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O y system (denoted as (Bi, Pb)-2223) with 0.0-0.3 wt% nano-size ZrO 2 particles (10-20 nm) addition synthesized by solid state reaction. Phase analysis by x-ray diffraction (XRD), granular structure examination by scanning electron microscopy (SEM), microstructure investigation by transmission electron microscopy (TEM) equipped with energy dispersive x-ray spectrometer (EDS), critical current density dependence on the applied magnetic field J c (H ) and electrical resistivity ρ(T, H ) were carried out. The results show that activation energies of vortex flux motion U (H ), critical current density J c (H ) behavior in applied magnetic field and volume pinning force density F p are enhanced by the addition of 0.1 wt% ZrO 2 . The pinning force analysis and microstructure observations indicated that the improvement of flux pinning is suggested to originate from the introduction of extrinsic pinning centers due to the formation of normal nano-sized Zr-rich phase.

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Section: Resultssupporting

confidence: 76%

Effect of nano-size ZrO₂addition on the flux pinning properties of (Bi, Pb)-2223 superconductor

Zouaoui¹,

Ghattas²,

Annabi³

et al. 2008

Supercond. Sci. Technol.

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“…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%

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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“…Для ВТСП классических составов -иттриевая, висмутовая и лантановая такая двухуровневость сверх-проводящих свойств известна [15][16][17][18][19][20][21]. К настоящему времени предложена модель, объясняющая совокупность, на первый взгляд, сложных для объяснения, магнитотранспортных свойств [21][22][23][24][25][26][27][28][29].…”

Section: Introductionunclassified

Влияние Внутригранульных Мейсснеровских Токов И Захваченного В Гранулах Потока На Эффективное Поле В Межгранульной Среде И Гистерезис Магнитосопротивления Гранулярного ВТСП

Балаев¹,

Семенов²,

Гохфельд³

2022

Физика Твердого Тела

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The concept of an effective field in an intergranular medium is used to describe the hysteresis magnetoresistance of granular HTSCs. This effective field is a superposition of the external magnetic field and the field induced by the magnetic moments of the superconducting granules. The magnetic moment of the granules is contributed by the shielding currents and the trapped magnetic flux. We studied and analyzed the effect of the trapped flux on the magnetoresistance. It has been experimentally shown that the dependence of the residual resistance (after applying of the external field) on the trapped flux clearly correlates with the behavior of the remanent magnetization. In addition, special attention was paid to a detailed comparison of the magnetoresistance of the granular YBa2Cu3O7-delta for two cases: (a) the magnetization of HTSC granules is caused only by the trapped magnetic flux (in a zero external field) and (b) HTSC granules are in the Meissner state (the external field is smaller than the first critical field of the granules). It has been found that Abrikosov vortices and intragranular Meissner currents differently affect the effective field in the intergranular medium (for the same values of magnetization for cases (a) and (b)). A possible reason for this difference is discussed.

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Dissipation mechanism in a high-Tc Bi1.7Pb0.3Sr2Ca2Cu3Ox granular superconductor

Cited by 29 publications

References 42 publications

Effect of nano-size ZrO₂addition on the flux pinning properties of (Bi, Pb)-2223 superconductor

Effect of nano-size ZrO₂addition on the flux pinning properties of (Bi, Pb)-2223 superconductor

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

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Dissipation mechanism in a high-Tc Bi1.7Pb0.3Sr2Ca2Cu3Ox granular superconductor

Cited by 29 publications

References 42 publications

Effect of nano-size ZrO2addition on the flux pinning properties of (Bi, Pb)-2223 superconductor

Effect of nano-size ZrO2addition on the flux pinning properties of (Bi, Pb)-2223 superconductor

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

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Effect of nano-size ZrO₂addition on the flux pinning properties of (Bi, Pb)-2223 superconductor

Effect of nano-size ZrO₂addition on the flux pinning properties of (Bi, Pb)-2223 superconductor