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Recent theoretical studies of topologically nontrivial electronic states inKondo insulators have pointed to the importance of spin-orbit coupling (SOC)for stabilizing these states. However, systematic experimental studies thattune the SOC parameter $\lambda_{\rm{SOC}}$ in Kondo insulators remain elusive.The main reason is that variations of (chemical) pressure or doping stronglyinfluence the Kondo coupling $J_{\text{K}}$ and the chemical potential $\mu$ --both essential parameters determining the ground state of the material -- andthus possible $\lambda_{\rm{SOC}}$ tuning effects have remained unnoticed. Herewe present the successful growth of the substitution seriesCe$_3$Bi$_4$(Pt$_{1-x}$Pd$_x$)$_3$ ($0 \le x \le 1$) of the archetypal(noncentrosymmetric) Kondo insulator Ce$_3$Bi$_4$Pt$_3$. The Pt-Pd substitutionis isostructural, isoelectronic, and isosize, and therefore likely to leave$J_{\text{K}}$ and $\mu$ essentially unchanged. By contrast, the large massdifference between the $5d$ element Pt and the $4d$ element Pd leads to a largedifference in $\lambda_{\rm{SOC}}$, which thus is the dominating tuningparameter in the series. Surprisingly, with increasing $x$ (decreasing$\lambda_{\rm{SOC}}$), we observe a Kondo insulator to semimetal transition,demonstrating an unprecedented drastic influence of the SOC. The fullysubstituted end compound Ce$_3$Bi$_4$Pd$_3$ shows thermodynamic signatures of arecently predicted Weyl-Kondo semimetal.

Kondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling