Electrodeposition as a new route to synthesize superconducting FeSe

摘要

We have successfully synthesized FeSe films by the electrochemical depositionin the electrolyte containing FeCl_{2}\cdot4H_{2}O, SeO_{2} and Na_{2}SO_{4}.The composition ratio of Fe and Se was controlled by the synthesis voltage andpH value. The FeSe film with the composition ratio of Fe : Se = 1 : 1 isfabricated at a voltage of -0.9 V and pH 2.1 in our electrochemical deposition.This sample has a highly crystalline tetragonal FeSe structure and exhibits asuperconducting transition at 8.1 K, comparable to FeSe synthesized by othermethods.