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Recently superconductivity was discovered in the Kagome metal AV3Sb5 (A = K,Rb, and Cs), which has an ideal Kagome lattice of vanadium. These V-basedsuperconductors also host charge density wave (CDW) and topological nontrivialband structure. Here we report the ultralow-temperature thermal conductivityand high pressure resistance measurements on CsV3Sb5 with Tc = 2.5 K, thehighest among AV3Sb5. A finite residual linear term of thermal conductivity atzero magnetic field and its rapid increase in fields suggest nodalsuperconductivity. By applying pressure, the Tc of CsV3Sb5 increases first,then decreases to lower than 0.3 K at 11.4 GPa, showing a clear firstsuperconducting dome peaked around 0.8 GPa. Above 11.4 GPa, superconductivityre-emerges, suggesting a second superconducting dome. Both nodalsuperconductivity and superconducting domes point to unconventionalsuperconductivity in this V-based superconductor. While our finding of nodalsuperconductivity puts a strong constrain on the pairing state of the firstdome, which should be related to the CDW instability, the superconductivity ofthe second dome may present another exotic pairing state in this ideal Kagomelattice of vanadium.

Nodal superconductivity and superconducting domes in the topological Kagome metal CsV3Sb5