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The kagome lattice is very attractive as it can host many novel quantumstates, such as the charge density wave, superconductivity, quantum spinliquid, etc. Meanwhile, iridates often exhibit a strong spin-orbit coupling(SOC) effect due to the large atomic mass of 5$d$ elements, which has importantimplications for both the energy bands and the pairing symmetry ofsuperconductors. For the Laves phase superconductor Sc$_2$Ir$_4$ with a kagomelattice, by doping Si to the Ir sites, we observed a nonmonotonic and two-domelike doping dependence of the superconducting transition temperature $T_{\rmc}$, which is typically found in many unconventional superconducting systems.Interestingly, for some samples, especially Sc$_2$Ir$_{3.5}$Si$_{0.5}$ with theoptimal $T_{\rm c}$, after the suppression of superconductivity, thenormal-state resistivity exhibits a semiconducting behavior; meanwhile, thespecific heat coefficient shows an upturn which follows the relation$C/T\propto{\rm ln}(T_0/T)$ at low temperatures. Around the optimal doping, theresistance measurements exhibit strong superconducting fluctuations. And thesuperconductivity related specific heat can be fitted by the model of a$d$-wave gap after subtracting the normal-state background. These stronglysuggest unconventional superconductivity and correlation effect in the samples,which is mainly induced by a flat band near the Fermi level when consideringthe SOC, as supported by the first-principles calculations. Our results reveala new unconventional superconducting system Sc$_2$Ir$_{4-x}$Si$_x$ with strongcorrelation effects induced by the flat band in the kagome system with strongSOC.

Unconventional superconductivity in Sc$_2$Ir$_{4-x}$Si$_x$ by spin-orbit coupling driven flat band