  Organic compounds are promising candidates to exhibit high temperature or
room temperature superconductivity. However, the critical temperatures of
organic superconductors are bounded to 38 K. By doping potassium into
$p$-terphenyl consisting of C and H elements with three phenyl rings connected
by single C-C bond in para position, we find that this material can have a
superconducting phase with the critical temperature of 43 K. The
superconducting parameters such as the critical fields, coherent length, and
penetration depth are obtained for this superconductor. These findings open an
encouraging window for the search of high temperature superconductors in chain
link organic molecules.
