Materials (III)

This chapter focuses on organic and nanoscale superconducting systems. The tetramethyl-tetraselenafulvalene (TMTSF) and ethylenedithiotetrathiafulvalene (ET) organic families, along with the fullerides, are described. Special attention is paid to graphene-like structures, which are examples of two-dimensional systems. As for nanoscale systems, small-scale nanoscale structures are introduced and the pairing in aromatic molecules, like coronene, is discussed. The presence of the energy shell in some nanoclusters makes the pairing of electrons with opposite projections of orbital momenta perfectly realistic. This phenomenon has been observed experimentally for some aluminium clusters with a Tc on the order of 120 K. The nano-based tunnelling networks can transfer a macroscopic dissipationless current. Interface superconductivity is discussed, with a special focus on the FeSe/SrTiO3 system. The dream of room temperature superconductivity, envisioned shortly after the discovery of the phenomenon, has become perfectly realistic. This final chapter on materials describes various paths towards to this goal.