Detection and Manipulation of Interaction Between Magnetic DyPc2 Molecules and Superconducting Pb(111) Surface

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Abstract Lanthanide double‐decker phthalocyanine (LnPc2) complexes are highly coveted for their prospective uses in ultrahigh‐density data storage and quantum computing. Notably, the quantum spin systems comprising these complexes and superconducting substrates exhibit unique quantum magnetic interactions. Through scanning tunneling microscopy (STM) and spectroscopy (STS) experiments, the interaction between the magnetic double‐decker DyPc2 molecules and the superconducting Pb(111) substrate is investigated. Three distinct adsorption patterns of DyPc2 on Pb(111) are experimentally observed. Combined with DFT calculations, it is found that the ligand spin of the normal DyPc2 molecules in the self‐assembled monolayer (SAM) is quenched, which is attributed to strong charge transfer from Pb(111). However, special DyPc2 molecules embedded in the SAM maintain ligand spin due to weak charge transfer, forming a complex quantum spin system with the superconducting substrate. Similarly, DyPc2 molecules located on the second layer exhibit the same behavior. Under zero magnetic field, the Yu–Shiba–Rusinov (YSR) resonances are observed within the superconducting energy gap of both spin quantum systems. The Kondo resonance and the superconducting pairing occur at similar energy scales, indicating their coexistence and competition. This ultimately results in a Kondo‐screened state. By controlling the sample bias, the special molecule can be switched to a normal molecule.

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