Volume 90, Number 5, June 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 June 2010|
Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2
National Institute for Materials Science - 1-2-1 Sengen, Tsukuba 305-0047, Japan
2 JST, TRIP - 1-2-1 Sengen, Tsukuba 305-0047, Japan
3 University of Tsukuba - 1-1-1 Tennodai, Tsukuba 305-0001, Japan
Corresponding author: MIZUGUCHI.Yoshikazu@nims.go.jp
Accepted: 1 June 2010
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 the transition temperature Tczero reached 8.5 K by the oxygen annealing at 200 °C. The shielding 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 the lattice.
PACS: 74.70.-b – Superconducting materials other than cuprates / 74.62.Dh – Effects of crystal defects doping and substitution / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition
© EPLA, 2010
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