Relationships between Superconductivity and Nematicity in FeSe_{1-x}Te_x (x=0-0.5) Films Studied by Complex Conductivity Measurements

We measured the complex conductivity, \sigma, of FeSe_{1-x}Te_x (x=0-0.5) films in the superconducting state which show a drastic increase of the superconducting transition temperature, T_\textrm{c}, when the nematic order disappears. Since the magnetic penetration depth, \lambda (> 400 nm), of Fe(Se,Te) is longer than the typical thickness of the film... Show more