Organic Superconductors - An Overwiev
Prof. Dr. Joachim Wosnitza (Helmholtz-Zentrum Dresden-Rossendorf)

More than 30 years after the discovery of the first organic superconductors, these materials remain a fascinating playground for studying fundamental low-dimensional physics. With their simple electronic structure and the easily accessible complete superconducting phase diagram these charge-transfer salts serve as model systems for layered superconductors. Still, the understanding of the nature of the superconducting state remains a challenge. The experimental picture is controversial with evidence both for unconventional as well as for BCS-like superconductivity. For the quasi-two-dimensional charge-transfer salts based on BEDT-TTF (bisethylenedithio-tetrathiafulvalene, or ET for short), the layered crystallographic structure leads to highly anisotropic electronic as well as superconducting properties. The corresponding very high orbital critical field for in-plane magnetic-field alignment allows for the occurrence of the Fulde–Ferrell–Larkin–Ovchinnikov state as evidenced by thermodynamic measurements. In my talk, I will highlight some of the intriguing aspects of organic superconductivity.