Determination of the intergrain critical-current distribution for polycrystalline (Tl,Pb)(Ba,Sr)2Ca2Cu3Oy superconductors from ac-susceptibility data
Osvaldo F. Schilling, Katsuzo Aihara, Atsuko Soeta, Tomoichi Kamo, Shin-pei Matsuda
DOI 10.1103/PhysRevB.47.8096 · Physical Review B
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Abstract
The intergrain critical-current-density (Jci) distribution and intergranular volume fraction of ceramic superconductors were determined from ac-susceptibility measurements. The sample was melt-treated polycrystalline (Tl,Pb)(Ba,Sr)2Ca2Cu3Oy [Tl (1:2:2:3)] high-Tc (∼119 K in zero field) superconductor for fields up to 80 K Oe and temperatures between 30 K and Tc. Experimental conditions were chosen so that the data could be analyzed with Bean’s critical-state model associated with an extended version of the effective-medium model for the material’s magnetic-shielding properties. Within this context equations relating the statistical distribution of intergrain critical currents in the sample with the measured susceptibility were derived.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Tl,Pb)(Ba,Sr)2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 119 | Pressure unresolved | zero_resistance |
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