Implications on the Band Structure of the Isostructural Family Tetrathiafulvalene Tetracyanoquinodimethane (TTF-TCNQ), Tetraselenafulvalene Tetracyanoquinodimethane (TSeF-TCNQ), and Their Solid Solutions from Spin-Resonance Measurements

Abstract

We show that electron-phonon coupling plays a major role in the spin relaxation of the isostructural family of organic metals, ${(\mathrm{TSeF})}_{x}{(\mathrm{TTF})}_{1\ensuremath{-}x}\mathrm{TCNQ}$ (tetraselenafulvalene tetrathiafulvalene tetracyanoquinodimethane). The dependence of this relaxation on the fraction of TSeF in the donor chain suggests a picture of hybridized donor-acceptor bands for TSeF-TCNQ in contrast to the nonhybridized bands of TTF-TCNQ.