Conducting and superconducting salts based on BEDTTTF and on some unsymmetrical tetrachalcogenafulvalenes

Abstract The physical properties of conducting and superconducting salts based on bis(ethylenedithio) tetrathiafulvalene and on some unsymmetrical tetrathiafulvalenes (containing ethylenedithio-,ethylenedioxy-,vinylenedithio-,dimethylethylenedithio-, and pyrazino- as additional heterogroups) are reportd. β-, υ-, and τ-phases are found to be the most important.