  Iron-chalcogenide compounds with FeSe(Te, S) layers did not attract much
attention until the discovery of high-Tc superconductivity (SC) in the
iron-pnictide compounds at the begining of 2008. Compared with FeAs-based
superconductors, iron-chalcogenide superconductors have aroused enormous
enthusiasm to study the relationship between SC and magnetisms with several
distinct features, such as different antiferromagnetic ground states with
relatively large moments in the parents, indicating possibly different
superconducting mechanisms, the existence of the excess Fe atoms or Fe
vacancies in the crystal lattice. Another reason is that the large single
crystals are easily grown for the iron-chalcogenide compounds. This review will
focus on our exploration for the iron-chalcogenide superconductors and
discussion on several issues, including the crystal structure, magnetic
properties, superconductivity, and phase separation. Some of them reach a
consensus but some important questions still remain to be answered.
