Electron-induced excitation of vibrations of Ce atoms inside a C 80 cage

• Inelastic electron tunneling spectroscopy of Ce 2@C 80 dimetallofullerenes reveals a low-energy inelastic excitation that is interpreted using ab initio calculations and associated with the movements of encapsulated Ce atoms inside the C 80 cage. The electron-vibration interaction in Ce 2@C 80 is unusually high, inducing a pronounced zero-bias anomaly in differential conductance of Ce 2@C 80. Our observations show that the atoms encapsulated in fullerene cages can actively participate in determining the properties of molecular junctions

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