Unexpected weak spatial variation in the local density of states induced by individual Co impurity atoms in superconducting Na(Fe1−xCox)As crystals revealed by scanning tunneling spectroscopy
Huan Yang, Zhenyu Wang, Delong Fang, Sheng Li, Toshikaze Kariyado, Genfu Chen, Masao Ogata, Tanmoy Das, A. V. Balatsky, Hai-Hu Wen
DOI 10.1103/PhysRevB.86.214512 · Physical Review B
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Abstract
We use spatially resolved scanning tunneling spectroscopy in Na(Fe1−xCox)As to investigate the impurity effect induced by Co dopants. The Co impurities are successfully identified, and the spatial distributions of local density of state at different energies around these impurities are investigated. It is found that the spectrum shows negligible spatial variation at different positions near the Co impurity, although there is a continuum of the in-gap states which lifts the zero-bias conductance to a finite value. Our results put constraints on the S± and S++ models and sharpen the debate on the role of scattering potentials induced by the Co dopants.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na(Fe1-xCox)As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.8 | Pressure not reported | unknown |
| Na(Fe1-xCox)As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21.2 | Pressure not reported | unknown |
| Na(Fe0.95Co0.05)As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.8 | Pressure not reported | unknown |
| Na(Fe0.975Co0.025)As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21.2 | Pressure not reported | unknown |
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