Applied Physics Letters · 2013 · 48 citations · 25 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsThin FilmsSuperconducting MaterialsSuperconducting Thin FilmsThin-film MaterialsHigh-temperature SuperconductorsIron-based Superconducting FilmsIron-based SuperconductorsPulsed Laser DepositionSuperconducting Critical TemperatureSuperconducting PropertiesThin-film SuperconductorsX-ray Diffraction Analysis
We demonstrate the growth of Co-doped BaFe2As2 (Ba-122) thin films on CaF2 (001), SrF2 (001), and BaF2 (001) single crystal substrates using pulsed laser deposition. All films are grown epitaxially despite of a large misfit of −10.6% for BaF2 substrate. For all films, a reaction layer is formed at the interface confirmed by X-ray diffraction and for the films grown on CaF2 and BaF2 additionally by transmission electron microscopy. The superconducting transition temperature of the film on CaF2 is around 27 K, whereas the corresponding values of the films on SrF2 and BaF2 are around 22 K and 21 K, respectively. The Ba-122 on CaF2 shows almost identical crystalline quality and superconducting properties as films on Fe-buffered MgO.
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