Journal
PHYSICAL REVIEW B
Volume 86, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.214512
Keywords
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Funding
- Ministry of Science and Technology of China [2011CBA00102, 2012CB821403, 2010CB923002]
- NSF
- PAPD of China
- US DOE [DE-AC52-06NA25396]
- Office of Science (BES)
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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. DOI: 10.1103/PhysRevB.86.214512
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