Microwave study of FeSe0.3Te0.7 thin film by TE011-mode sapphire dielectric resonator

Just as CuO-plane is the basic building block of high-Tc cuprate superconductors, the FeAs-layer is the basic structure of the newly discovered FeAs-based superconducting pnictides 1. However, unlike the rigid CuO-plane in cuprates, partial substitution of Fe by Co or Ni, or As by P within the FeAs-layer can effectively induce superconductivity 234. In this sense, the discovery of superconductivity in binary FeSe
x
(Tc∼8 K) is of great interests, since it only contains the superconducting FeSe-layer which has identical structure as FeAs-layer, and the Se deficiency may cause the superconductivity 5.