| Autor: |
Cai, C., Hänisch, J., Hühne, R., Stehr, V., Mickel, C., Gemming, T., Holzapfel, B. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 12/15/2005, Vol. 98 Issue 12, p123906, 6p, 2 Diagrams, 6 Graphs |
| Abstrakt: |
A series of quasimultilayers of YBa2Cu3O7-δ(YBCO)/Y2O3, namely, 70×[YBCO(m)/Y2O3(n)] (m=40 pulse, and n=2, 5, 10, and 20 pulse) were prepared on single-crystal SrTiO3 using pulsed-laser deposition. X-ray diffraction measurements revealed that both in-plane and out-of-plane textures of YBCO in the present quasimultilayers are as good as in pure YBCO films. Nanoscale Y2O3 precipitates grow epitaxially inside YBCO. With increasing Y2O3 pulse number, Tc decreases slightly, while ΔTc remains less than 1.5 K. As well, the YBCO lattice parameter c has an increasing trend with increasing n. This can be attributed to the effect of epitaxial strain induced by lattice mismatch. The flux pinning force density in films with lower Y2O3 content (such as n=2), is improved in large ranges of field and temperature. In contrast, films with high Y2O3 content show enhanced flux pinning only at low temperature, which is understandable from the temperature dependence of irreversibility fields. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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