We identify a distinct superconducting phase at the interface of a La1.48Nd0.4Sr0.12CuO4 / La1.84Sr0.16CuO4 epitaxial bilayer system using ac screening measurements. A model based on interdiffusion of quasiparticles and condensate at the interface yields a thickness of ∼25nm for the interfacial layer. Two-dimensional superconductivity of the interface layer appears to be governed by Kosterlitz-Thouless-Berezinskii transition. A parallel magnetic field suppresses the superconducting transition temperature of this layer with a pair-breaking parameter α varying as H2 .
Physical Review B
- Pub Date:
- July 2010
- Superconducting films and low-dimensional structures;
- Magnetic properties;
- Condensed Matter - Superconductivity
- Phys. Rev. B 82, 024518 (2010)