Superconductivity in FeTe 1- x S x Induced by Electrochemical Reaction Using Ionic Liquid Solution

Superconductivity in FeTe0.8S0.2 is successfully induced by an electrochemical reaction using an ionic liquid solution. A clear correlation between the Fe concentration in the solution and superconductivity was confirmed, suggesting that superconductivity is induced by the deintercalation of excess Fe.