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Perovskite-type iridates SrIrO$_{3}$ and CaIrO$_{3}$ are a Dirac line nodesemimetal protected by crystalline symmetry, providing an interestingplayground to investigate electron correlation effects on topologicalsemimetals. The effect of Sn doping was examined by growingSrIr$_{1-x}$Sn$_{x}$O$_{3}$ and CaIr$_{1-x}$Sn$_{x}$O$_{3}$ thin filmsepitaxially on SrTiO$_{3}$(001) substrate using pulsed laser deposition. UponSn doping, the semimetallic ground state switches into an insulator. Astemperature is lowered, the resistivity, $\rho (T)$, ofSrIr$_{1-x}$Sn$_{x}$O$_{3}$ above a critical doping level ($x_{\text{c}} \sim0.1$) shows a well-defined transition from the semimetal to a weaklyferromagnetic insulator at $T = T_{\text{c}}$. In contrast, the $\rho (T)$ ofCaIr$_{1-x}$Sn$_{x}$O$_{3}$ with increasing $x$ shows a rapid increase ofmagnitude but does not show clear signature of metal-insulator transition inthe temperature dependence. We argue that the contrasted behavior of the twoclosely related iridates reflects the interplay between the effects of electroncorrelation and disorder enhanced by Sn doping.

Contrasted Sn Substitution effects on Dirac line node semimetals SrIrO$_{3}$ and CaIrO$_{3}$