Physics – Condensed Matter – Superconductivity
Scientific paper
2011-11-28
Physics
Condensed Matter
Superconductivity
17 pages, 10 figures, 1 table
Scientific paper
Phase diagrams of as-grown and O2-annealed FeTe1-xSex determined from magnetic susceptibility measurement were obtained. For as-grown samples, the antiferromagnetic order was fully suppressed in the range region x \geq 0.15, and weak superconductivity appeared when x \geq 0.1. Beginning at x = 0.5, weak superconductivity was found to evolve into bulk superconductivity. Interestingly, for O2-annealed samples, complete suppression of magnetic order and the occurrence of bulk superconductivity were observed when x \geq 0.1. We found that O2-annealing induces bulk superconductivity for FeTe1-xSex. Oxygen probably plays a key role in the suppression of the magnetic order and the appearance of bulk superconductivity.
Deguchi Keita
Demura Satoshi
Kawasaki Yasuhiro
Okazaki Hiroyuki
Ozaki Taisuke
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