Superconductivity at 5 K in alkali-metal-doped phenanthrene

X.F. Wang, R.H. Liu, Z. Gui, Y.L. Xie, Y.J. Yan, J.J. Ying, X.G. Luo and X.H. Chen ()
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X.F. Wang: University of Science and Technology of China
R.H. Liu: University of Science and Technology of China
Z. Gui: State Key Laboratory of Fire Science, University of Science and Technology of China
Y.L. Xie: University of Science and Technology of China
Y.J. Yan: University of Science and Technology of China
J.J. Ying: University of Science and Technology of China
X.G. Luo: University of Science and Technology of China
X.H. Chen: University of Science and Technology of China

Nature Communications, 2011, vol. 2, issue 1, 1-7

Abstract: Abstract Organic superconductors have π-molecular orbitals, from which electrons can become delocalized, giving rise to metallic conductivity due to orbital overlap between adjacent molecules. Here we report the discovery of superconductivity at a transition temperature (Tc) of ~5 K in alkali-metal-doped phenanthrene. A 1-GPa pressure leads to a 20% increase of Tc, suggesting that alkali-metal-doped phenanthrene shows unconventional superconductivity. Raman spectra indicate that alkali-metal doping injects charge into the system to realize the superconductivity. The discovery of superconductivity in A3phenanthrene (where A can be either K or Rb) produces a novel broad class of superconductors consisting of fused hydrocarbon benzene rings with π-electron networks. An increase of Tc with increasing number of benzene rings from three to five suggests that organic hydrocarbons with long chains of benzene rings are potential superconductors with high Tc.

Date: 2011
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DOI: 10.1038/ncomms1513

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