Investigation on lattice parameters and superconducting properties in Fe(Te, Se, S) ternary-chalcogen system

A series of samples with the nominal compositions Fe1.02Te0.85Se0.15−xSx (x = 0, 0.0375, 0.075, 0.1125 and 0.15) have been synthesized to study the influence of the S substitution of Se on the lattice parameters and superconducting properties. It has been found that the S substitution basically has no effect on the lattice parameters a and c of the tetragonal phase. However, Tc of Fe1.02(Te0.85Se0.15−xSx) superconductors clearly decreases with S doping.