A new family of oxycarbonate superconductors, the synthesis and their physical properties, has been reviewed. In 1992, Miyazaki
et al. have synthesized the new compound Sr
2CuO
2 (CO
3), which opened to the new family of oxycarbonate superconductors. On the basis of“block layers concept”, we have attempted to design a series of oxycarbonate compounds having the new crystal structure and made superconductivity by an appropriate carrier doping and, succeeded to synthsize many new oxycarbonate superconductors.
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