HECHTL, M and BERNHARD, J and RENK, KF (1994) COMMON FEATURES OF (PB, SR) AND (PB, CA) 1212 SUPERCONDUCTORS PRODUCED ON O2 AT NORMAL-PRESSURE. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 7 (6). pp. 407-411. ISSN 0953-2048,
Full text not available from this repository.Abstract
We prepared superconducting samples of the 1212 systems (Pb0.5Sr0.5)Sr2(yl-xCax)Cu2O7+/-delta and (Pb0.5Ca0.5)Sr2(Y1-xCax)Cu2O7+/-delta in an oxidizing atmosphere of normal 02 pressure. By variation of the Y/Ca ratio an optimum of the temperature at which superconductivity sets in, T(c)ons, 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 N2 improves the normal state conductivity and increases T(c)ons and also T(c)R=0 for most of the samples.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | OXYGEN; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:40 |
| URI: | https://pred.uni-regensburg.de/id/eprint/53268 |
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