Superconductivity, intergrain, and intragrain critical current densities of materials
J. R. Thompson, J. Brynestad, D. M. Kroeger, Y. C. Kim, S. T. Sekula, D. K. Christen, E. D. Specht
DOI 10.1103/PhysRevB.39.6652 · Physical Review B
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Abstract
Bulk sintered and powdered samples of the high-temperature superconductive compounds Tl2Ca2Ba2Cu3O1+δ (Tl-2:2:2:3) and Tl2Ca2Ba2Cu2O8+δ (Tl-2:1:2:2) have been synthesized with phase purity of approximately 90%. The materials were characterized by x-ray-diffraction, metallographic, and electron microprobe analyses. The electronic and superconductive properties were investigated through measurement of the electrical resistivity and the critical current density Jc using transport methods and by extensive magnetization measurements. Primary results and conclusions are that (1) the intragrain Jc values were large, much larger than the transport values; (2) both sintered and powdered materials exhibited large flux creep; (3) and the Jc decreased exponentially with temperature. These features are qualitatively very similar to those found in the corresponding YBa2Cu3Oz (with z≊7) series of compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ca2Ba2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ca2Ba2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2CaBa2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2CaBa2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
| RBa2Cu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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