Fluctuation model of organic superconductivity: Internal inconsistencies and contradictory experimental evidence

Internal inconsistencies in the scheme of large superconducting fluctuations, as applied to the superconducting ${\left(\mathrm{TMTSF}\right)}_{2}X$ compounds (ditetramethyltetraselenafulvalenium salts), are discussed. In particular, it is shown that the assumption of very small interchain coupling is self-contradictory. These materials are actually best regarded as (anisotropic) three-dimensional superconductors. The fluctuation scheme does not provide a consistent interpretation of the data, but is in fact contradicted by many key measurements, including the thermal conductivity, heat capacity, conductivity anisotropy, and critical-field anisotropy.