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Organic materials are believed to be potential superconductor with hightransition temperature (TC). Organic superconductors mainly have two families:the quasi-one dimensional (TMTSF)2X and two dimensional (BEDT-TTF)2X (Ref. 1and 2), in which TMTSF is tetramethyltetraselenafulvalene (C10H12Se4) andBEDT-TTF or "ET" is bis(ethylenedithio)tetrathiafulvalene (C10H8S8). One keyfeature of the organic superconductors is that they have {\pi}-molecularorbitals, and the {\pi}-electron can delocalize throughout the crystal givingrise to metallic conductivity due to a {\pi}-orbital overlap between adjacentmolecules. The introduction of charge into C60 solids and graphites with{\pi}-electron networks by doping to realize superconductivity has beenextensively reported3,4. Very recently, superconductivity in alkali-metal dopedpicene with {\pi}-electron networks was reported5. Here we report the discoveryof superconductivity in potassium doped Phenanthrene with TC~5 K. TC increaseswith increasing pressure, and the pressure of 1 GPa leads to an increase of 20%in TC, suggesting that the potassium doped phenanthrene shows unconventionalsuperconductivity. Both phenanthrene and picene are polycyclic aromatichydrocarbons, and contain three and five fused benzene rings, respectively. Theribbon of fused benzene rings is part of graphene. Therefore, the discovery ofsuperconductivity in K3Phenanthrene produces a novel broad class ofsuperconductors consisting of fused hydrocarbon benzene rings with{\pi}-electron networks. The fact that TC increases from 5 K for KxPhenanthrenewith three benzene rings to 18 K for Kxpicene with five benzene rings suggeststhat such organic hydrocarbons with long benzene rings is potentialsuperconductor with high TC.

Superconductivity at 5 K in potassium doped phenanthrene