Water-induced superconductivity in SrFe2As2

Abstract

It has been considered that FeAs-based high transition temperature (high-Tc) superconductors need electron or hole doping by aliovalent ion substitution or large off-stoichiometry in order to induce superconductivity. We report that exposure of undoped SrFe2As2 epitaxial thin films to water vapor induces a superconducting transition. These films exhibit a higher onset-Tc (25 K) and larger magnetic field anisotropy than those of cobalt-doped SrFe2As2 epitaxial films, suggesting that the mechanism for the observed superconducting transition differs from that of the aliovalent-ion doped SrFe2As2. The present finding provides a new approach to induce superconductivity with a higher Tc in FeAs-based superconductors.

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• Superconductivity in Iron Compounds
• Recent advances in iron-based superconductors toward applications
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Advantageous grain boundaries in iron pnictide superconductors
• 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
• Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped BaFe${}_2$As${}_2$
• A perspective on pnictide superconductors
• Moisture-induced superconductivity in FeTe0.8S0.2
• 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
• Alcoholic beverages induce superconductivity in FeTe${}_{1-x}$S${}_x$
• 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)
• Possible hydrogen doping and enhancement of Tc (= 35 K) in a LaFeAsO-based superconductor
• Phase diagram of superconductivity and antiferromagnetism in single crystals of Sr(Fe1-xCox)2As2 and Sr1-yEuy(Fe0.88Co0.12)2As2
• Superconductivity in Undoped BaFe2As2 by Tetrahedral Geometry Design
• Magnetic and structural transitions in La${}_{0.4}$Na${}_{0.6}$Fe${}_2$As${}_2$ single crystals
• Superconductivity in PbO-type Fe chalcogenides
• Superconducting Properties and Phase Diagram of Indirectly Electron-Doped (Sr1-xLax)Fe2As2 Epitaxial Films Grown by Pulsed Laser Deposition
• Large low-temperature magnetoresistance in SrFe2As2 single crystals
• Interfacially enhanced superconductivity in Fe(Te,Se)/Bi4Te3 heterostructures
• Classification of superconductors on Tc Map
• Superconductivity in the Iron-Pnictide Parent Compound SrFe2As2