Bulk superconductivity in FeTe1−xSex via physicochemical pumping of excess iron
Lianyang Dong, He Zhao, Ilija Zeljkovic, Stephen D. Wilson, John W. Harter
DOI 10.1103/PhysRevMaterials.3.114801 · Physical Review Materials
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Abstract
The iron-based superconductor FeTe1−xSex 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 physicochemical process for pumping this interstitial iron out of the FeTe1−xSex matrix and achieving bulk superconductivity. Our method should have significant value for the synthesis of high-quality single crystals of FeTe1−xSex with large superconducting volume fractions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeTe1-xSex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.5 | Pressure not reported | unknown |
| Fe1.08Te0.59Se0.41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | onset |
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