| Автор | M Hechtl |
| Автор | J Bernhard |
| Автор | K F Renk |
| Дата выпуска | 1994-06-01 |
| dc.description | We prepared superconducting samples of the 1212 systems (Pb<sub>0.5</sub>Sr<sub>0.5</sub>)Sr<sub>2</sub>(Y<sub>1-x</sub>Ca<sub>x</sub>)Cu<sub>2</sub>O<sub>7+or- delta </sub> and (Pb<sub>0.5</sub>Ca<sub>0.5</sub>)Sr<sub>2</sub>(Y<sub>1-x</sub>Ca<sub>x</sub>)Cu<sub>2</sub>O<sub>7+or- delta </sub> in an oxidizing atmosphere of normal O<sub>2</sub> pressure. By variation of the Y/Ca ratio an optimum of the temperature at which superconductivity sets in, T<sub>c</sub><sup>ons</sup>, was found for x=0.80 in both systems. X-ray diffraction studies give evidence that the range of stability of the 1212 structure with respect to x is slightly greater in the (Pb,Ca) system than in the (Pb,Sr) system. We observed an increase of the lattice constants with x, suggesting that structural stress increases with Ca content. The loss of weakly bound O after post-annealing and quenching the samples in liquid N<sub>2</sub> improves the normal state conductivity and increases T<sub>c</sub><sup>ons</sup> and also T<sub>c</sub><sup>R=0</sup> for most of the samples. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Common features of (Pb,Sr) and (Pb,Ca) 1212 superconductors produced on O<sub>2</sub> at normal pressure |
| Тип | paper |
| DOI | 10.1088/0953-2048/7/6/013 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 7 |
| Первая страница | 407 |
| Последняя страница | 411 |
| Аффилиация | M Hechtl; Inst. fur Angewandte Phys., Regensburg Univ., Germany |
| Аффилиация | J Bernhard; Inst. fur Angewandte Phys., Regensburg Univ., Germany |
| Аффилиация | K F Renk; Inst. fur Angewandte Phys., Regensburg Univ., Germany |
| Выпуск | 6 |
