Structure of the oxygen-annealed chalcogenide superconductor Fe 1.08Te 0.55Se 0.45O x

Hefei Hu; Jian Min Zuo; Mao Zheng; James N. Eckstein; Wan Kyu Park; Laura H. Greene; Jinsheng Wen; Zhijun Xu; Zhiwei Lin; Qiang Li; Genda Gu

doi:10.1103/PhysRevB.85.064504

Structure of the oxygen-annealed chalcogenide superconductor Fe _1.08Te _0.55Se _0.45O _x

Hefei Hu, Jian Min Zuo, Mao Zheng, James N. Eckstein, Wan Kyu Park, Laura H. Greene, Jinsheng Wen, Zhijun Xu, Zhiwei Lin, Qiang Li, Genda Gu

Research output: Contribution to journal › Article › peer-review

Abstract

The as-grown single crystal Fe _1.08Te _0.55Se _0.45 with the tetragonal PbO-type structure is nonsuperconducting owing to the excess Fe. Superconductivity is induced after oxygen annealing with an onset and zero resistance transition temperature around 14.5 K and 11.5 K, respectively. The oxygen doping is evidenced by electron energy loss spectroscopy and accompanied by improved homogeneity in the remaining PbO-type phase, as well as an increase in the L ₃/L ₂ intensity ratio of the Fe-L _2,3 edge, indicating an increase in Fe valence. Local phase transformation from the tetragonal PbO-type phase to the hexagonal NiAs-type phase is also observed after oxygen annealing.

Original language	English (US)
Article number	064504
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.85.064504
State	Published - Feb 6 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.85.064504

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Cite this

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title = "Structure of the oxygen-annealed chalcogenide superconductor Fe 1.08Te 0.55Se 0.45O x ",

abstract = "The as-grown single crystal Fe 1.08Te 0.55Se 0.45 with the tetragonal PbO-type structure is nonsuperconducting owing to the excess Fe. Superconductivity is induced after oxygen annealing with an onset and zero resistance transition temperature around 14.5 K and 11.5 K, respectively. The oxygen doping is evidenced by electron energy loss spectroscopy and accompanied by improved homogeneity in the remaining PbO-type phase, as well as an increase in the L 3/L 2 intensity ratio of the Fe-L 2,3 edge, indicating an increase in Fe valence. Local phase transformation from the tetragonal PbO-type phase to the hexagonal NiAs-type phase is also observed after oxygen annealing.",

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language = "English (US)",

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T1 - Structure of the oxygen-annealed chalcogenide superconductor Fe 1.08Te 0.55Se 0.45O x

AU - Hu, Hefei

AU - Zuo, Jian Min

AU - Zheng, Mao

AU - Eckstein, James N.

AU - Park, Wan Kyu

AU - Greene, Laura H.

AU - Wen, Jinsheng

AU - Xu, Zhijun

AU - Lin, Zhiwei

AU - Li, Qiang

AU - Gu, Genda

PY - 2012/2/6

Y1 - 2012/2/6

N2 - The as-grown single crystal Fe 1.08Te 0.55Se 0.45 with the tetragonal PbO-type structure is nonsuperconducting owing to the excess Fe. Superconductivity is induced after oxygen annealing with an onset and zero resistance transition temperature around 14.5 K and 11.5 K, respectively. The oxygen doping is evidenced by electron energy loss spectroscopy and accompanied by improved homogeneity in the remaining PbO-type phase, as well as an increase in the L 3/L 2 intensity ratio of the Fe-L 2,3 edge, indicating an increase in Fe valence. Local phase transformation from the tetragonal PbO-type phase to the hexagonal NiAs-type phase is also observed after oxygen annealing.

AB - The as-grown single crystal Fe 1.08Te 0.55Se 0.45 with the tetragonal PbO-type structure is nonsuperconducting owing to the excess Fe. Superconductivity is induced after oxygen annealing with an onset and zero resistance transition temperature around 14.5 K and 11.5 K, respectively. The oxygen doping is evidenced by electron energy loss spectroscopy and accompanied by improved homogeneity in the remaining PbO-type phase, as well as an increase in the L 3/L 2 intensity ratio of the Fe-L 2,3 edge, indicating an increase in Fe valence. Local phase transformation from the tetragonal PbO-type phase to the hexagonal NiAs-type phase is also observed after oxygen annealing.

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