Earlier incorrect proposals for organic superconductors have the virtue of pinpointing the need for a deeper understanding of the metallic state in organic materials. Accordingly, we consider the effects of interstack coupling on the electronic band structure of TTF‐TCNQ, showing that a one‐electron theory predicts semimetallic behavior. We argue, however, that this state is unstable at low T against a ferroelectric distortion perpendicular to the stacking axis, which produces a gap. With increasing T, the gap is filled by states which are localized (in the Anderson sense) by thermal disorder on individual stacks, thereby restoring one‐dimensional metallic conductivity.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Physical and Theoretical Chemistry