Abstract
Spin-orbit-coupled electronic transitions between donor and acceptor conduction bands are shown to account for the ESR linewidth in tetrathiafulvalenium tetracyanoquinodimethanide (TTF-TCNQ) and similar compounds. Slight admixture of in-plane () donor orbital character into the acceptor conduction () bands via the overlap of these orbitals is essential, since the donor heavy atom spin-orbit interaction mixes effectively only donor and orbitals. The corresponding spin-orbit transitions within or between donor stacks are usually symmetry forbidden, which result is significant for the one-stack salts.
- Received 12 January 1982
DOI:https://doi.org/10.1103/PhysRevB.26.2682
©1982 American Physical Society