Evolution of charge dynamics in FeSe_{1-x}Te_{x}: Effects of electronic correlations and nematicity

We systematically studied in-plane optical conductivity of FeSe_{1-x}Te_{x} thin films fabricated on CaF_{2} substrates for x = 0, 0.1, 0.2, and 0.4. This system shows a large enhancement of superconducting transition temperature T_{\mathrm{c}} at x \sim 0.2 and a gentle decrease in T_{\mathrm{c}} with further increasing x. The low-energy optical... Show more