Bulk superconductivity in FeTe${}_{1-x}$Se${}_x$ via physicochemical pumping of excess iron

Abstract

The iron-based superconductor FeTe${}_{1-x}$Se${}_x$ has attracted considerable attention as a candidate topological superconductor owing to a unique combination of topological surface states and bulk high-temperature superconductivity. The superconducting properties of as-grown single crystals, however, are highly variable and synthesis dependent due to excess interstitial iron impurities incorporated during growth. Here we report a novel physicochemical process for pumping this interstitial iron out of the FeTe${}_{1-x}$Se${}_x$ matrix and achieving bulk superconductivity. Our method should have significant value for the synthesis of high-quality single crystals of FeTe${}_{1-x}$Se${}_x$ with large superconducting volume fractions.

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Cited by in corpus (3)

• Visualizing nematic transition and nanoscale suppression of superconductivity in Fe(Te,Se)
• Oxygen adsorption induced superconductivity in ultrathin FeTe film on SrTiO3(001)
• Removal of excess iron by annealing processes and emergence of bulk superconductivity in sulfur-substituted FeTe