Control of the Magnetic Interaction between Single-Molecule\nMagnet TbPc<sub>2</sub> and Superconductor NbSe<sub>2</sub> Surface\nby an Intercalated Co Atom

We\ndemonstrate that an intercalated Co atom in superconductor NbSe<sub>2</sub> could control the magnetic interaction between the adsorbed\nmagnetic molecule of TbPc<sub>2</sub> and the NbSe<sub>2</sub> substrate.\nAn intercalated Co atom enhances the magnetic interaction between\nthe NbSe<sub>2</sub> and the TbPc<sub>2</sub> spin to cause Kondo\nresonance at the TbPc<sub>2</sub> position, a spin-singlet state formed\nby the itinerary electron. By applying a surface-normal magnetic field,\nwe change the molecule’s spin direction from the initial one\ndirected to the Co atom to the surface normal. The change appears\nas a split Kondo resonance at the TbPc<sub>2</sub>, one of which is\nenhanced at the Tb site, which disappears when the outer magnetic\nfield normal to the surface is applied and never appears, even if\nwe return <i>B</i> to 0 T. The phenomenon suggests that\nthe intercalated magnetic atoms can control the magnetic interaction\nbetween a magnetic molecule and the superconductor NbSe<sub>2</sub>.