Fig. 2: Kondo effect of Tb₂Pc₃.

a STM image (V = −1.0 V and I = 10 pA) of an imbedded type-1 Tb₂Pc₃. b Tunneling spectra (V = 50 mV and I = 100 pA) taken at locations indicated in (a) at 2 T, showing Kondo resonances and the upper LUMO. The fitting curves are shown in gray. c, d dI/dV mapping of (a) taken at the indicated energies. e Variation of the resonance width extracted from the spectra taken along the blue arrow in (c). f Tunneling spectra taken at the same location of a Tb₂Pc₃, showing evolution of the Kondo resonance with decreasing tip height δZ, where δZ = 0 pm is set at V = 5 mV and I = 50 pA. g The Kondo peak width extracted from (a) as a function of δZ.