Electronic Properties of a New Radical-Cation Salt, Tetraselenotetracene-Iodide: Evidence for Quasi Metallic Behavior at very Low Temperatures
The investigation of nearly one dimensional metals has reached these last years a quite interesting stage of development. Among the new materials which have been discovered, the organic charge transfer complexes (CTC) belonging to the TTF (tetrathiofulvale-nium)-TCNQ (tetracyanoquinodimethane) series present an outstanding feature. However, one of them, only, does not present a metal-insulator transition due to an electronic PEIERLS distortion and shows therefore an appreciable electrical conductivity at very low temperatures: this is the hexamethylene — tetrase-lenofulvalenium HMTSeF-TCNQ (1). Furthermore, under pressure a semi-metallic behavior has been found because of a large increase of the electrical conductivity along the cations and anions chains (2).
KeywordsCharge Transfer Complex Thermal Variation Paramagnetic Susceptibility NATO Advance Study Institute Anion Chain
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