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Lead phthalocyanine (PbPc), a nonplanar molecule, is studied on Pb (100) by scanning tunneling spectroscopy. A rigid shift of the molecular orbitals is found between molecules with the central Pb ion pointing toward (PbPc) or away from (PbPc) the substrate and is understood from the interaction between the molecules and their image charges. Within the superconducting energy gap, Yu-Shiba-Rusinov (YSR) resonances are observed for PbPc molecules in islands, indicating the presence of a magnetic moment. Such bound states are not present on PbPc molecules, nor on isolated PbPc or molecules that have lost the Pb ion during deposition (H₀Pc). The YSR energies vary depending on the orientation and type of the molecular neighbors. We analyze the role of the out-of-plane electrostatic dipole moment of PbPc.
Homberg et al. (Tue,) studied this question.