Abstract
The temperature dependence of inter- and intragranular currents in (Bi,Pb)2Sr2Ca2Cu3O10+x superconductors in the range of temperatures 10-100 K was studied. The experiments were magnetic and, in order to distinguish the contributions from the two kinds of currents, they were performed with two samples of similar grains: a bulk sample of strongly coupled grains and a sample without intergranular coupling (powder sample).
| Original language | English |
|---|---|
| Pages (from-to) | 2199-2200 |
| Number of pages | 2 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 282 |
| Issue number | PART 4 |
| DOIs | |
| Publication status | Published - Aug 1997 |
| MoE publication type | A1 Journal article-refereed |
Funding
The measurements were done with two cylindrical samples with a nominal composition (Bi0.9Pb0,1)2Sr2 The first one, a pressed powder sample (PP) consisted of pressed reacted 2223-phase powder without any further thermomecha-nical treatment, thus representing a system of practically non-coupled grains (i.e. only intragranu-lar currents). The second sample was prepared from the same 2223-phase starting powder but after the initial compacting it was heat treated and repeatedly pressed, thus representing a sample with “strong” intergranular Josephson coupling (SJC) between the grains and with both inter-and intragranular currents. The sample dimensions were 9.4 mm in diameter and 14 mm in height. The magnetisation of the samples at 77 K has been studied in detail in Refs. [3] and [4], where the sample preparation details are also described. The samples were untextured and consisted of plate-like grains with typical thickness of 1 pm and diameter of 10 km. Intergranular J, of the sample SJC was 540 A/cm’ at T=77K (Be=20 mT, E= 1 pV/cm). The transport J, of the PP sample was zero, as expected. The magnetisation of the SJC sample at 77 K was dominated by intergranular magnetisation currents, the contribution of intragranular currents being detectable, too. For the presented measurements a sample was placed in a continues flow cryostat in such a way that the external magnetic field B, was parallel to the axis of the cylinder. The sample magnetic field B, was measured by a miniature Hall sensor in external fields up to 200 mT in the range * Supported by the Slovak Grant Agency, Grant No. 1185. + Supported by the Finnish Academy and Emil Aaltonen Foundation.
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