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Recently V-based Kagome metal attracted intense attention due to theemergence of superconductivity in the low temperature. Here we report thefabrication and physical investigations of the high quality single-crystallinethin films of the Kagome metal KV$_3$Sb$_5$. For the sample with the thicknessof about 15 nm, the temperature dependent resistance reveals aBerezinskii-Kosterlitz-Thouless (BKT) type behavior, indicating the presence oftwo-dimensional superconductivity. Compared with the bulk sample, the onsettransition temperature $T^{onset}_{c}$ and the out-of-plane upper criticalfield $H_{c2}$ are enhanced by 15\% and more than 10 times respectively.Moreover, the zero-resistance state is destroyed by a magnetic field as low as50 Oe. Meanwhile, the temperature-independent resistance is observed in a widefield region, which is the hallmark of quantum metallic state. Our resultsprovide evidences for the existence of unconventional superconductivity in thismaterial.

Enhancement of the superconductivity and quantum metallic state in the thin film of superconducting Kagome metal KV$_3$Sb$_5$