Superconductivity Induced in Iron Telluride Films by Low Temperature Oxygen Incorporation

Details Superconductivity Induced in Iron Telluride Films by Low Temperature Oxygen Incorporation Superconductivity Induced in Iron Telluride Films by Low Temperature Oxygen Incorporation

2009-12-22

arxiv.org/abs/0912.4539v2

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.82.020508

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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