Superconductivity Induced in Iron Telluride Films by Low Temperature Oxygen Incorporation

Abstract

We report superconductivity induced in films of the non-superconducting, antiferromagnetic parent material FeTe by low temperature oxygen incorporation in a reversible manner. X-ray absorption shows that oxygen doping changes the nominal Fe valence state from 2+ in the non-superconducting state to mainly 3+ in the superconducting state. Thus superconductivity in O doped FeTe occurs in a quite different charge and strain state than the more common FeTe${}_{1-x}$Se${}_x$. This work also suggests a convenient path for conducting doping experiments in-situ with many measurement techniques.

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• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• First-Principle Wannier function analysis of the electronic structure of PdTe: Weaker magnetism and superconductivity
• Molecular beam epitaxy preparation and in situ characterization of FeTe thin films
• Observation of two-level critical state in the superconducting FeTe thin films
• Oxygen adsorption induced superconductivity in ultrathin FeTe film on SrTiO3(001)
• Mystery of superconductivity in FeTe films and the role of neighboring layers
• The influence of magnetic order on the magnetoresistance anisotropy of Fe${}_{1+\delta -x}$Cu${}_x$Te
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control