Superconductivity in Iron Chalcogenide Compounds Induced by Battery-Like Reaction

Abstract

 Superconductivity of FeTe_0.8S_0.2 was successfully induced by a battery-like reaction found in a typical Li-ion battery. Excess Fe in FeTe_0.8S_0.2 was electrochemically de-intercalated and the superconducting properties were improved systematically by applying a voltage in both electrolysis citric acid aqueous solution and ionic liquid. This result suggests that this method can be used to develop new superconducting materials.