Abstract
We investigated the S-doping-driven phase transition from antiferromagnetic to superconducting in FeTe1−xSx single crystals. The partial substitution of Te by S suppresses antiferromagnetism in Fe-square lattice. Superconductivity is induced by oxygen annealing for only FeTe1−xSx in which the long-range magnetic ordering is suppressed. To realize superconductivity in FeTe1−xSx, both S concentration enough to suppress antiferromagnetism and oxygen annealing are required. Anisotropy of superconductivity in oxygen-annealed FeTe0.886S0.114 was estimated to be 1.17.
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