  Kagome lattice offers unique opportunities for the exploration of unusual
quantum states of correlated electrons. Here, we report on the observation of
superconductivity in a kagome single crystal Pd3P2S8 when a semiconducting to
metallic transition is driven by pressure. High-pressure resistance
measurements show that the metallization and superconductivity are
simultaneously observed at about 11 GPa. With increasing pressure, the
superconducting critical temperature Tc is monotonously enhanced from 2.6 K to
a maximum 7.7 K at ~52 GPa. Interestingly, superconductivity retains when the
pressure is fully released. Synchrotron XRD and Raman experiments consistently
evidence that the emergence of superconductivity is accompanied with an
amorphization and the retainability of superconductivity upon decompression can
be attributed to the irreversibility of the amorphization.
