Percolation in YBa2Cu3O7−δ/CuO mixtures

Mammou, A.; Brau, A.; Azema, A.; Farges, J.; Gilabert, A.

doi:10.1016/0921-4534(94)90761-7

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…In this work two effects were considered to estimate the dependence of the critical current density on sample geometry for a granular superconductor: the self-field effects mentioned above and the increase of J c connected with the fact that, when the sample cross-section increases, a greater number of percolative paths appear in the superconductor. The latter effect, which is a consequence of percolation theory [13,14] (usually applied to study the transport properties of ceramic superconductors [15,16]), has been never explicitly considered, as far as we know, to describe the J c dependence on sample size.…”

Section: Introductionmentioning

confidence: 99%

Choice of sample size for high transport critical current density in a granular superconductor: percolation versus self-field effects

Mulet¹,

Díaz²,

Altshuler

1997

Supercond. Sci. Technol.

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The percolative character of the current paths and the self-field effects were considered to estimate optimal sample dimensions for the transport current of a granular superconductor by means of a Monte Carlo algorithm and critical-state model calculations. We showed that, under certain conditions, self-field effects are negligible and the J c dependence on sample dimensions is determined by the percolative character of the current. Optimal dimensions are demonstrated to be a function of the fraction of superconducting phase in the sample.

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Section: Introductionmentioning

confidence: 99%

Choice of sample size for high transport critical current density in a granular superconductor: percolation versus self-field effects

Mulet¹,

Díaz²,

Altshuler

1997

Supercond. Sci. Technol.

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“…the minimum volume percentage of superconductor in a non-superconducting matrix that shows a zero in the transport property, varies. A zero in TEP could be obtained without getting zero resistance for the electrical conduction (Jha et al 1989;Mammou et al 1994). We pursued this work further, and analysed two series of samples with CuO added respectively to Bil.6Pb0.4SrzCa2-Cu30~ and YIBazCu3OT_,~, for various studies like resistivity, TEP, XRD and SEM.…”

Section: Introductionmentioning

confidence: 99%

Effect of CuO addition in Bi-Sr-Ca-Cu-O and Y-Ba-Cu-O ceramics

Mishra

Dheer

1999

Bull Mater Sci

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The effect of adding CuO matrix to BiF6Pb0.4SrzCa2Cu30 a and YIBa2Cu308 superconductors was investigated through resistivity, XRD, SEM, thermoelectric power (TEP), and ac magnetization studies. Samples with as low as 20% (by weight) of the superconducting phase showed superconducting transition in resistivity-temperature (R-T), with the superconducting zero around 77 K in thermoelectric power, critical current (J~) values were evaluated by applying Bean's critical state model. CuO could be added to the superconducting material without any significant deterioration in the quality of the samples, up to a concentration of as low as 40% (by weight) of the superconducting material.

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