Exploration of metastable iron selenium-based superconductors
Intercalated iron selenium(FeSe)-based superconductors have emerged as a prominent subject of research in the field of condensed matter physics due to their high superconducting transition temperatures and unique Fermi surface topology,which exhibit distinct electron-pairing mechanisms compared to other iron-based superconductors.Owing to the lowest oxidation state of Fe being 2+,intercalation through conventional high-temperature methods inevitably leads to phase separation and formation of magnetic insulating phases with ordered Fe vacancies,hindering investigations into their intrinsic properties.To address this challenge,low-temperature intercalation methods such as the liquid ammonia,solvothermal,and hydrothermal methods,have been developed.These approaches have successfully synthesized a series of single-phase superconductors without Fe vacancies.Herein,we provide a comprehensive review of the design,development,and progress of intercalated FeSe superconductors and outline future research directions in this field.
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