Abstract
Quasi one-dimensional half-filled radical salt DMTSA-BF 4 shows high conductivity (σ gp ≈ 450Ω −1cm −1 ) and the metal-like temperature dependence down to ca. 180K, in contrast to the conventional half-filled organic charge-transfer salts. By the physical properties measurements we characterize the compound as a metal around room temperature due to the large t. On lowering temperature the system undergoes Peierls transition and becomes a semiconductor. Hubbard parameters U eff and t for DMTSA-BF 4 are estimated at 1.2 eV and 0.36 eV respectively.
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