Abstract
THE classical, but still recent, example of an organic metal, TTF–TCNQ, has been fully investigated and reviewed by two groups1,2. It has a room temperature electrical conductivity of ∼103 Ω−1 cm−1 which increases on cooling to a maximum, with σm/σRT ∼ 10–15, at ∼ 58 K (ref. 1), where it undergoes a metal–semiconductor transition. In 5 of 150 crystals, σm/σRT > 20–150 has been reported1. Recently3 a congener HMTSF–TCNQ (hexamethylene tetraselenafulvalinium tetracyanoquino-dimethanide) was reported to have σRT = 1,391–2,178 Ω−1 cm−1 increasing to σm/σRT ∼ 3.4 at 75–45 K, when it decreases to σ/σRT = 0.3 at 1.5 K. These organic substances showed no superconducting transition, in contrast with the inorganic polymer (SN)X which, while mostly behaving similarly4, also shows the onset of superconductivity at 0.26 K (ref. 5).
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ASHWELL, G., ELEY, D. & WILLIS, M. Organic complex radical anion salt metallic down to 30 mK. Nature 259, 201–202 (1976). https://doi.org/10.1038/259201a0
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DOI: https://doi.org/10.1038/259201a0
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