Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2
Yoshikazu Mizuguchi, Keita Deguchi, Shunsuke Tsuda, Takahide Yamaguchi, and Yoshihiko Takano
TL;DR
Oxygen annealing significantly enhances superconductivity in FeTe0.8S0.2 by inducing lattice shrinkage, leading to zero resistivity at 8.5 K and nearly complete superconducting volume fraction.
Contribution
This study demonstrates that oxygen annealing can induce and improve bulk superconductivity in FeTe0.8S0.2 through lattice compression.
Findings
Superconducting transition temperature reached 8.5 K after oxygen annealing.
Superconducting volume fraction increased from 0 to nearly 100%.
Lattice constants were compressed by oxygen annealing.
Abstract
Oxygen annealing dramatically improved the superconducting properties of solid-state-reacted FeTe0.8S0.2, which showed only a broad onset of superconducting transition just after the synthesis. The zero resistivity appeared and reached 8.5 K by the oxygen annealing at 200\degree C. The superconducting volume fraction was also enhanced from 0 to almost 100%. The lattice constants were compressed by the oxygen annealing, indicating that the evolution of bulk superconductivity in FeTe0.8S0.2 was correlated to the shrinkage of lattice.
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