Iron-based superconductors (IBSCs) have attracted sustained research attention over the past decade, partly because new IBSCs were discovered one after another in the earlier years. At present, however, exploration of IBSCs becomes more and more challenging. A research team from Zhejiang University developed a structural design strategy for exploration from which they succeeded in finding a series of hole-doped IBSCs with double FeAs layers in recent years. Nevertheless, the electron-doped analogue has not been realized until now.
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