2015/05/22 by Gina M. Friederichs, Friederichs, Gina M., Matthias P. B. Wörsching +3
Materials Science · #FOS: Physical sciences #Iron-based superconductors research #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.1505.06066
openalex publication_date 2015/05/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Superconductivity in anti-PbO-type iron chalcogenides Fe1-xTe1-ySey (x = 0,\n0.1, y = 0.1 0.4) depends on the amount (x) of interstitial iron atoms located\nbetween the FeTe1-ySey layers. Non-superconducting samples of nominal\nFe1.1Te1-ySey convert to superconductors with critical temperatures up to 14 K\nafter annealing at 300\degC in an oxygen atmosphere. The process is\nirreversible upon subsequent hydrogen annealing. Magnetic measurements are\nconsistent with the formation of iron oxides suggesting that oxygen annealing\npreferably extracts interstitial iron from Fe1-xTe1-ySey which interfere with\nsuperconductivity.\n