Scanning Tunneling Microscopy/Spectroscopy on Optimally Ni doped Single Crystal BaFe$_{2}$As$_{2}$
ORAL
Abstract
Doping the iron pnictide parent compound brings the material into superconducting state. It is intriguing that different dopants can result in different maximum Tc's. In this talk we will present the scanning tunneling microscopy and spectroscopy data on (001) surface of the optimally doped single crystal BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$ (Tc $\sim $ 20 K) and compare them to the results from the optimally Co doped BaFe$_{2}$As$_{2}$.
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