Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped BaFe${}_2$As${}_2$

Abstract

Epitaxial growth of Fe-based superconductors such as Co-doped SrFe${}_2$As${}_2$ (SrFe${}_2$As${}_2$:Co) was reported recently, but has still insufficient properties for device application because they have rough surfaces and are decomposed by reactions with water vapor in an ambient atmosphere. This letter reports that epitaxial films of Co-doped BaFe${}_2$As${}_2$ grown at 700 oC show the onset superconducting transition tempearture of 20 K. The transition is sharper than those observed on the SrFe${}_2$As${}_2$:Co films, which would originate from their improved crystallinity. These films also have atomically-flat surfaces with steps-and-terraces structures and exhibit chemical stability against exposure to water vapor.

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• Iron-Based Superconductors: current status of materials and pairing mechanism
• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• Advantageous grain boundaries in iron pnictide superconductors
• Strong Tc dependence for strained, epitaxial Ba(Fe1-xCox)2As2 thin films
• High Critical Current Density 4 MA/cm2 in Co-Doped BaFe2As2 Epitaxial Films Grown on (La, Sr)(Al, Ta)O3 Substrates without Buffer Layers
• Scaling behaviour of the critical current in clean epitaxial Ba(Fe1-xCox)2As2 thin films
• Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe(1-x)Co(x))2As2 bilayers
• DC superconducting quantum interference devices fabricated using bicrystal grain boundary junctions in Co-doped BaFe2As2 epitaxial films
• Versatile fluoride substrates for Fe-based superconducting thin films
• Thin film growth by pulsed laser deposition and properties of 122-type iron-based superconductor AE(Fe1--xCox)2As2 (AE = alkaline earth)
• Narrow Bandgap in beta-BaZn2As2 and Its Chemical Origins
• Critical factor for epitaxial growth of cobalt-doped BaFe2As2 films by pulsed laser deposition
• Transport properties of ultrathin BaFe1.84Co0.16As2 superconducting nanowires
• Advanced surface characterization of Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$ epitaxial thin films