In-situ epitaxial growth of FeSe0.5Te0.5 thin films is demonstrated on a nonoxide substrate CaF2. Structural analysis reveals that compressive stress is moderately added to 36-nm-thick FeSe 0.5Te0.5, which pushes up the critical temperature to above 15K, showing higher values than that of bulk crystals. The critical current density at T = 4.5 K reaches 5.9 × 104 A cm -2 at μ0H= 10T, and 4.2 × 104Acm -2 at μ0H = 14T. These results indicate that fluoride substrates have high potential for the growth of iron-based superconductors in comparison with popular oxide substrates.
ASJC Scopus subject areas
- Physics and Astronomy(all)