Abstract
Abstract Superconductivity in organic materials has been realized in charge transfer salts. Category of the materials has been expanded from TMTSF cation salts to BEDT-TTF and DMET cation salts and to Ni(dmit)2 anion salts. The organic superconductors are characterized by highly anisotropic nature and low carrier density. The influence of the on-site Coulomb energy has been the subject of arguments and the relations to the copper oxide superconductors are discussed with this respect. The organic superconductors so far are sensitive to disorders even if they are nonmagnetic. Conducting polymers and organic films have been expected to be superconductors with high potential use, but, to substantiate these, defect-free materials are demanded.
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