We have systematically substituted Sr for Ca as spacer of the CuO2 planes in Bi2Sr2+xCa1-xCu2 O8+δ thin films deposited by molecular beam epitaxy, from x=0 (2212 phase) to x = 1 (2302 phase). From dc transport measurements we have found a decrease of Tc-zero from 88 K for x = 0 down to 55 K for x = 1. 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.
|Pages (from-to)||925041 - 925044|
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1 Mar 2003|
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
Di Luccio, T., Lukić, V., Oh, S., Maritato, L., & Eckstein, J. N. (2003). Complete substitution of Sr for Ca in Bi. Physical Review B - Condensed Matter and Materials Physics, 67(9), 925041 - 925044. .