k-(ET)9Cu[N(CN)9]Br, where ET is the cation-radical donor molecule bis-(ethyleneditio) tetrathiafulvalene, has to date the highest ambient-pressure transition temperature (T) for an organic superconductor. The resistive onset transition temperature is 12.5K and the inductive onset is 11.6K1).
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Kopylov, V.N., Palnichenko, A.V. (1993). Specific Heat of the High Tc Organic Superconductor k-(ET)2Cu[N(CN)2]Br. In: Bernier, P., Fischer, J.E., Roth, S., Solin, S.A. (eds) Chemical Physics of Intercalation II. NATO ASI Series, vol 305. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2850-0_46
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