  Preliminary evidence for the occurrence of high-Tc superconductivity in
alkali-doped organic materials, such as potassium-doped p-terphenyl (KPT), were
recently obtained by magnetic susceptibility measurements and by the opening of
a large superconducting gap as measured by ARPES and STM techniques. In this
work, KPT samples have been synthesized by a chemical method and characterized
by low-temperature Raman scattering and resistivity measurements. Here, we
report the occurrence of a resistivity drop of more than 4 orders of magnitude
at low temperatures in KPT samples in the form of compressed powder. This fact
was interpreted as a possible sign of a broad superconducting transition taking
place below 90 K in granular KPT. The granular nature of the KPT system appears
to be also related to the 20 K broadening of the resistivity drop around the
critical temperature.
