We have systematically substituted Sr for Ca as spacer of the (formula presented) planes in (formula presented) thin films deposited by molecular beam epitaxy, from (formula presented) (2212 phase) to (formula presented) (2302 phase). From dc transport measurements we have found a decrease of (formula presented)-zero from 88 K for (formula presented) down to 55 K for (formula presented) The remarkable result reported here is the presence of superconductivity when Ca is completely replaced by Sr. Comparison of structural and transport data shows that the enlargement of the unit cell due to the substitution has no dramatic effect on the onset of superconductivity. This result is compared to previous studies and existing results on bilayer systems.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Mar 13 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics