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Superconductivity in monolayers. Currently, 2D aspect of this material remains largely unexplored. Iron Selenide (FeSe) is a member of layered materials. FeSe is considered as the parent material of the simplest family of iron-based superconductors. The crystal structure of iron selenide consists of a continuous stacking of FeSe layers, where a square-lattice layer of iron atoms is sandwiched between two twice-sparser layers of bonding chalcogen atoms with in P4nmm space group. Overall, this crystal is similar to other popular layered materials such as graphite, graphene, MoS2, etc. with weak interlayer coupling. Recently, it has been reported that the FeSe monolayers become superconducting at 65K > Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films (Nature Materials 2013 doi:10.1038/nmat3654) >Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films Nature Materials 2013 doi:10.1038/nmat3648) The crystal has been developed in 2012 in our state-of-art facilities. The crystals come fully characterized, and ready for exfoliation.