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Explore new superconductors in layered transition metal chalcogenides by using topochemical reactions

Hai Lin (University of Zurich)

Layered transition metal chalcogenides always show a lot of novel properties, such as high-Tc superconductivity in cuprates and iron-based superconductors. Low-temperature topochemical reactions performed on these layered materials, either by reductive anion deintercalation or oxidative anion insertion, offer many opportunities for synthesizing and tuning a wide range of novel, metastable materials. 
By using topochemical reactions, numerous new superconductors have been found, like the intercalated-type FeSe superconductors. In this talk, I will introduce the synthesis, structure, and physical properties of three intercalated superconductors Li1-xFexOHFeSe, FeS, LiOHFeS, and several new vanadium-based layered materials CsV2-xSe2O, V2Se2O.