Deposition of superconducting Ba2Can-1CunO2n(O,F)2 thin films by pulsed laser ablation
Abstract
The highest ever superconducting critical temperature (Tc) of 120 K has been reported for the compound Ba2Can-1CunO2n(O,F)2 (F-02(n-1)n). However, only bulk samples have been synthesized to date and extremely high pressures have been required. Here, the deposition of superconducting Ba2Can-1CunO2n(O,F)2 films on a SrTiO3(100) substrate was investigated using Nd-YAG pulsed laser ablation under an O2 pressure of 16-19 Pa at a substrate temperature of 740-750 °C. The films exhibited a superconducting onset temperature (Tco) of 76.5 K and a zero resistance temperature (Tce) of 22.5 K. The dominant diffraction peaks matched those reported for c-axis oriented Ba2Ca2Cu2O6(O,F)2 (n = 3) bulk samples. However, the Tc values for the films were much lower than that for the bulk material, even though the ablation target composition was Ba2Ca2Cu3O6+δ(O,F)2, which yields the highest bulk Tc value.
- Publication:
-
Journal of Physics Conference Series
- Pub Date:
- December 2014
- DOI:
- 10.1088/1742-6596/568/2/022023
- Bibcode:
- 2014JPhCS.568b2023K