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.

References in corpus (21)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• The superconductivity at 18 K in LiFeAs system
• Thorium-doping induced superconductivity up to 56 K in Gd1-xThxFeAsO
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2
• Superconductivity in SrFe_(2-x)Co_xAs_2: Internal Doping of the Iron Arsenide Layers
• Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer
• Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
• Crystal orientation and thickness dependence of superconductivity on tetragonal FeSe1-x thin films
• Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films
• Suppression of superconductivity in FeSe films under tensile strain
• Superconductivity in Epitaxial Thin Films of Co-Doped SrFe2As2 with Bilayered FeAs Structures and their Magnetic Anisotropy
• Heteroepitaxial growth and optoelectronic properties of layered iron oxyarsenide, LaFeAsO
• Preparation and superconductivity of iron selenide thin films
• Epitaxial growth and anisotropy of La(O,F)FeAs thin films deposited by Pulsed Laser Deposition
• Water-induced superconductivity in SrFe2As2
• High quality epitaxial FeSe0.5Te0.5 thin films grown on SrTiO3 substrates by pulsed laser deposition
• Superconducting Fe(1+delta)Se(1-x)Te(x) thin films: Growth, characterization and properties

Cited by in corpus (32)

• Superconductivity in Iron Compounds
• Recent advances in iron-based superconductors toward applications
• 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
• New Fe-based superconductors: properties relevant for applications
• Advantageous grain boundaries in iron pnictide superconductors
• Template engineering of Co-doped BaFe2As2 single-crystal thin films
• 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
• Josephson junction in cobalt-doped BaFe2As2 epitaxial thin films on (La, Sr)(Al, Ta)O3 bicrystal substrates
• Direct observation of a nodeless superconducting energy gap in the optical conductivity of iron-pnictides
• In-situ growth of superconducting NdFeAs(O,F) thin films by Molecular Beam Epitaxy
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• 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
• High critical-current density with less anisotropy in BaFe2(As,P)2 epitaxial thin films: Effect of intentionally grown c-axis vortex-pinning centers
• Mechanochemical synthesis of pnictide compounds and superconducting Ba0.6K0.4Fe2As2 bulks with high critical current density
• Versatile fluoride substrates for Fe-based superconducting thin films
• Highly anisotropic energy gap in superconducting Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$ from optical conductivity measurements
• Potassium-doped BaFe2As2 superconducting thin films with a transition temperature of 40 K
• 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
• Enhanced critical-current in P-doped BaFe2As2 thin films on metal substrates arising from poorly aligned grain boundaries
• Superfluid density measurements of Ba(CoxFe1-x)2As2 films near optimal doping
• Electronic phase diagram of disordered Co doped BaFe2As2
• Critical factor for epitaxial growth of cobalt-doped BaFe2As2 films by pulsed laser deposition
• Transport and magnetic properties of Co-doped BaFe_{2}As_{2} epitaxial thin films
• Epitaxial Growth and Electronic Structure of a Layered Zinc Pnictide Semiconductor, beta-BaZn2As2
• Angle-Resolved Photoemission Spectroscopy of Iron-Chalcogenide Superconductor Fe1.03Te0.7Se0.3 : Strong-Coupling Superconductivity and Universality of Inter-Band Scattering
• 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