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We present the effect of yttrium substitution on superconductivity in theLa$_{1-\textit{x}}$Y$_{\textit{x}}$O$_{0.5}$F$_{0.5}$BiS$_{2}$ system.Polycrystalline samples with nominal Y concentrations up to 40% weresynthesized and characterized via electrical resistivity, magneticsusceptibility, and specific heat measurements. Y substitution reduces thelattice parameter \textit{a} and unit cell volume \textit{V}, and a correlationbetween the lattice parameter \textit{c}, the La-O-La bond angle, and thesuperconducting critical temperature $T_c$ is observed. The chemical pressureinduced by Y substitution for La produces neither the high-$T_c$superconducting phase nor the structural phase transition seen inLaO$_{0.5}$F$_{0.5}$BiS$_{2}$ under externally applied pressure.

Effect of yttrium substitution on the superconducting properties of the system La$_{1-\textit{x}}$Y$_{\textit{x}}$O$_{0.5}$F$_{0.5}$BiS$_{2}$