  By using high pressure synthesis method, we have fabricated the potassium
doped para-terphenyl. The temperature dependence of magnetization measured in
both zero-field-cooled and field-cooled processes shows step like transitions
at about 125 K. This confirms earlier report about the possible
superconductivity like transition in the same system. However, the
magnetization hysteresis loop exhibits a weak ferromagnetic background. After
removing this ferromagnetic background, a Meissner effect like magnetic
shielding can be found. A simple estimate on the diamagnetization of this step
tells that the diamagnetic volume is only about 0.0427% at low temperatures, if
we assume the penetration depth is much smaller than the size of possible
superconducting grains. This magnetization transition does not shift with
magnetic field but is suppressed and becomes almost invisible above 1.0 T. The
resistivity measurements are failed because of an extremely large resistance.
By using the same method, we also fabricated the potassium doped
para-quaterphenyl. A similar step like transition at about 125 K was also
observed by magnetization measurement. Since there is an unknown positive
background and the diamagnetic volume is too small, it is insufficient to
conclude that this step is derived from superconductivity although it looks
like.
