Nuclear Spin-Lattice Relaxation and Local Susceptibilities in Tetrathiafulvalene Tetracyanoquinodimethane

Abstract

We present the temperature dependence of the proton spin-lattice relaxation rates (${{T}_{1}}^{\ensuremath{-}1}$) for pure tetrathiafulvalene tetracyanoquinodimethane (TTF-TCNQ) and its deuterated analogs TTF(${\mathrm{D}}_{4}$)-TCNQ and TTF-TCNQ(${\mathrm{D}}_{4}$). In the metallic region, the relaxation is Korringa-like, characteristic of metals without strong electron-electron Coulomb correlations.