Magnetism and superconductivity sharing a common border in organic conductors

摘要

The class of organic solids based on cation radical salts deriving from the parent molecule TTF provides one- and two-dimensional conductors (superconductors) in which the electron delocalization proceeds via a strong overlap between neighbouring molecules. Their magnetic properties reveal in both series a common border between magnetism and superconductivity. Furthermore, the existnce of antiferromagnetic fluctuations in the conducting phase is clearly established by susceptibility and NMR experiments. Magnetism is also relevant in the alkali-doped fullerene A_1C_(60) and gives rise to an antiferromagnetic ground state and strong ferromagnetic fluctuations at high temperature.