Oxygen-annealing effects on superconductivity in polycrystalline Fe1-xTe1-ySey

Gina M. Friederichs; Matthias P. B. Wörsching; Dirk Johrendt

Oxygen-annealing effects on superconductivity in polycrystalline Fe1-xTe1-ySey

Superconductivity 2015-05-25 v1

Authors: Gina M. Friederichs , Matthias P. B. Wörsching , Dirk Johrendt

Abstract

Superconductivity in anti-PbO-type iron chalcogenides Fe1-xTe1-ySey (x = 0, 0.1, y = 0.1 0.4) depends on the amount (x) of interstitial iron atoms located between the FeTe1-ySey layers. Non-superconducting samples of nominal Fe1.1Te1-ySey convert to superconductors with critical temperatures up to 14 K after annealing at 300{\deg}C in an oxygen atmosphere. The process is irreversible upon subsequent hydrogen annealing. Magnetic measurements are consistent with the formation of iron oxides suggesting that oxygen annealing preferably extracts interstitial iron from Fe1-xTe1-ySey which interfere with superconductivity.

Keywords

iron chalcogenide superconductivity oxygen annealing interstitial iron Fe1-xTe1-ySey critical temperature

Cite

@article{arxiv.1505.06066,
  title  = {Oxygen-annealing effects on superconductivity in polycrystalline Fe1-xTe1-ySey},
  author = {Gina M. Friederichs and Matthias P. B. Wörsching and Dirk Johrendt},
  journal= {arXiv preprint arXiv:1505.06066},
  year   = {2015}
}

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