Epitaxial growth of FeSe${}_{0.5}$Te${}_{0.5}$ thin films on CaF${}_2$ substrates with high critical current density

Abstract

In-situ epitaxial growth of FeSe${}_{0.5}$Te${}_{0.5}$ thin films is demonstrated on a non-oxide substrate CaF${}_2$. Structural analysis reveals that compressive stress is moderately added to 36-nm thick FeSe${}_{0.5}$Te${}_{0.5}$, which pushes up the critical temperature above 15 K, showing higher values than that of bulk crystals. Critical current density at $T$ = 4.5 K reaches 5.9 x 10${}^4$ Acm${}^{-2}$ at ${\mu }_{0}H$ = 10 T, and 4.2 x 10${}^4$ Acm${}^{-2}$ at ${\mu }_{0}H$ = 14 T. These results indicate that fluoride substrates have high potential for the growth of iron-based superconductors in comparison with popular oxide substrates.

9 pages, 3 figures, to be published in Applied Physics Express 4, 053101 (2011)

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Cited by in corpus (15)

• Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe${}_{1-x}$Te${}_x$ thin films
• Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films
• Versatile fluoride substrates for Fe-based superconducting thin films
• Electric double-layer transistor using layered iron selenide Mott insulator TlFe1.6Se2
• High performance FeSe0.5Te0.5 thin films grown at low temperature by pulsed laser deposition
• Highly textured oxypnictide superconducting thin films on metal substrates
• Influence of substrate type on transport properties of superconducting FeSe0.5Te0.5 thin films
• The influence of the in-plane lattice constant on the superconducting transition temperature of FeSe0.7Te0.3 thin films
• Investigation of Transport Properties for FeSe${}_{1-x}$Te${}_x$ Thin Films under Magnetic Fields
• Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance
• Realization of epitaxial thin films of the superconductor K-doped BaFe${}_{\text{2}}$As${}_{\text{2}}$
• Superconducting fluctuations in FeSe${}_{0.5}$Te${}_{0.5}$ thin films probed via microwave spectroscopy
• Transport properties of ultrathin BaFe1.84Co0.16As2 superconducting nanowires
• Picosecond Trajectory of Two-dimensional Vortex Motion in FeSe${}_{0.5}$Te${}_{0.5}$ Visualized by Terahertz Second Harmonic Generation
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique