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New iron-based intercalation superconductors Ax(C2H8N2)yFe2−zSe2 (A=Li, Na) with Tc=45K have successfully been synthesized via intercalation of dissolved alkaline metal in ethylenediamine. The c-axis lengths of Ax(C2H8N2)yFe2−zSe2 (A=Li, Na) are 20.74(7)Å and 21.9(1)Å, respectively, and are about 50% larger than that of KxFe2Se2, indicating that not only alkaline metal but also ethylenediamine is...
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