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Insulator-to-Superconductor Transition upon Electron Doping in a BiS<sub>2</sub>-Based Superconductor Sr<sub>1โ</sub><i><sub>x</sub></i>La<i><sub>x</sub></i>FBiS<sub>2</sub>
Effects of electron doping on the BiS$_2$-based superconductors Sr$_{1-x}$La$_x$FBiS$_2$ ($0\le x\le 0.6$) have been investigated using the systematically synthesized polycrystals. The pristine compound is a band insulator with the BiS$_2$ layer, which accommodates electron carriers through the La substitution for Sr, as evidenced by the change in x-ray absorption spectra โฆ