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We performed high-pressure transport studies on the flat-band Kagomecompounds, Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$ ($x$ = 0, 0.25), with a diamondanvil cell. For both compounds, the resistivity exhibits an insulating behaviorwith pressure up to 17 GPa. With pressure above 20 GPa, a metallic behavior isobserved at high temperatures in Pd$_3$P$_2$S$_8$, and superconductivityemerges at low temperatures. The onset temperature of superconductingtransition $T_{\rm C}$ rises monotonically from 2 K to 4.8 K and does notsaturate with pressure up to 43 GPa. For the Se-doped compoundPd$_3$P$_2$(S$_{0.75}$Se$_{0.25}$)$_8$, the $T_{\rm C}$ is about 1.5 K higherthan that of the undoped one over the whole pressure range, and reaches 6.4 Kat 43 GPa. The upper critical field with field applied along the $c$ axis attypical pressures is about 50$\%$ of the Pauli limit, suggesting a 3Dsuperconductivity. The Hall coefficient in the metallic phase is low andexhibits a peaked behavior at about 30 K, which suggests either a multi-bandelectronic structure or an electron correlation effect in the system.

Pressure-induced superconductivity in flat-band Kagome compounds Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$