Abstract
We investigate the effect of individual atomic impurities on the superconductingstate that they are embedded in. Using low temperature scanning tunnelingmicroscopy and spectroscopy we could identify Co and Mn atoms in theCoxNbSe2 andMnxNbSe2 single crystals and observe the influence on the local electronic density of states (LDOS) at0.4 K. We find that Co is in the weak scattering limit. In this case the LDOS is quitehomogeneous on the sample surface, despite the number of defects, and retains sharpcoherent superconducting peaks. This is in strong contrast to the effects of Mn impurities,which locally destroy superconductivity. In this case the LDOS shows a strongenhancement of spectral weight inside the superconducting gap even far from the Mnatoms. Moreover, two impurity bound states are found within the superconducting gap atE/Δ0 = 0.18 and 0.36 at locations close to defects.
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