High-Temperature Superconductivity in Lattice-Expanded C60

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Science  28 Sep 2001:
Vol. 293, Issue 5539, pp. 2432-2434
DOI: 10.1126/science.1064773

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C60 single crystals have been intercalated with CHCl3 and CHBr3 in order to expand the lattice. High densities of electrons and holes have been induced by gate doping in a field-effect transistor geometry. At low temperatures, the material turns superconducting with a maximum transition temperature of 117 K in hole-doped C60/CHBr3. The increasing spacing between the C60 molecules follows the general trend of alkali metal–doped C60 and suggests routes to even higher transition temperatures.

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