Water-induced superconductivity in SrFe2As2
Hidenori Hiramatsu, Takayoshi Katase, Toshio Kamiya, Masahiro Hirano, Hideo Hosono
DOI 10.1103/PhysRevB.80.052501 · Physical Review B
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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 an interesting approach to induce superconductivity with a higher Tc in FeAs-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure unresolved | onset |
| SrFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure unresolved | zero_resistance |
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