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.

References in corpus (10)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Dynamics and mechanism of oxygen annealing in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystal
• Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2
• Annealing, acid, and alcoholic beverage effects on Fe1+yTe0.6Se0.4
• Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe1+yTe0.6Se0.4 Single Crystal
• Bulk Superconductivity in Fe1+yTe0.6Se0.4 Induced by Removal of Excess Fe

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