Superconductivity in oxygen-annealed FeTe1-xSx single crystal
Yoshikazu Mizuguchi, Keita Deguchi, Yasuna Kawasaki, Toshinori Ozaki,, Masanori Nagao, Shunsuke Tsuda, Takahide Yamaguchi, Yoshihiko Takano
TL;DR
This study explores how sulfur doping and oxygen annealing induce superconductivity in FeTe1-xSx single crystals by suppressing antiferromagnetic order, highlighting the conditions necessary for superconductivity.
Contribution
It demonstrates that both sufficient S doping and oxygen annealing are essential to induce superconductivity in FeTe1-xSx, providing insights into the phase transition mechanisms.
Findings
Superconductivity is achieved after oxygen annealing in S-doped FeTe1-xSx.
S doping suppresses antiferromagnetic order in the material.
The anisotropy of superconductivity was estimated to be 1.17.
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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