Control of the Magnetic Interaction between Single-Molecule Magnet TbPc 2 and Superconductor NbSe 2 Surface by an Intercalated Co Atom.

We demonstrate that an intercalated Co atom in superconductor NbSe 2 could control the magnetic interaction between the adsorbed magnetic molecule of TbPc 2 and the NbSe 2 substrate. An intercalated Co atom enhances the magnetic interaction between the NbSe 2 and the TbPc 2 spin to cause Kondo resonance at the TbPc 2 position, a spin-singlet state formed by the itinerary electron. By applying a surface-normal magnetic field, we change the molecule's spin direction from the initial one directed to the Co atom to the surface normal. The change appears as a split Kondo resonance at the TbPc 2 , one of which is enhanced at the Tb site, which disappears when the outer magnetic field normal to the surface is applied and never appears, even if we return B to 0 T. The phenomenon suggests that the intercalated magnetic atoms can control the magnetic interaction between a magnetic molecule and the superconductor NbSe 2 .