Fig. 3. STS of hybridized Shiba states in an AFM-coupled $\sqrt{3}a/2-\left[1\overline{1}1\right]$ Mn dimer.

a dI/dV spectrum taken between the two atoms of a $\sqrt{3}a/2-\left[1\overline{1}1\right]$ Mn dimer (blue). A reference spectrum taken on a single Mn adatom (black) and a patch of clean Nb(110) (gray) are pasted to the background. Shiba states are labeled and marked by arrows. b STM image of a $\sqrt{3}a/2-\left[1\overline{1}1\right]$ Mn dimer. The white scale bar has a length of 500 pm and also applies to panels d–i (V_bias = 6 mV and I = 1 nA). c 3D rendered illustration of the positions of the two Mn adatoms (black spheres) in the investigated dimer with respect to the Nb substrate atoms (yellow spheres), including the spin structure indicated by green and red arrows. d–i dI/dV maps measured on the dimer shown in panel b for the given bias voltages where a peak/shoulder is visible in the spectrum in a. The dI/dV maps taken at the Shiba peaks on the positive bias side are shown in Supplementary Fig. 7.) The same orientation from panel b applies to these maps. Red circles in b and d–i denote the locations of the Mn adatoms in the dimer.