Role of the Extra-Fe in K2-xFe4+ySe5 superconductors

27 Aug 2018 Wang Chih-Han Lee Chih-Chien Huang Gwo-Tzong Yang Jie-Yu Wang Ming-Jye Sheu Hwo-Shuenn Lee Jey-Jau Wu Maw-Kuen

The exact superconducting phase of K2-xFe4+ySe5 has yet conclusively decided since its discovery due to its intrinsic multiphase in early material. In an attempt to resolve the mystery, we have carried out systematic structural studies on a set of well controlled samples with exact chemical stoichiometry K2-xFe4+xSe5 (x=0~0.3) that are heat-treated at different temperatures... (read more)

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