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Metallic Rb4C60 and Rb5C60 on the top layer of C60 single crystal |
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| Authors: | Hongnian Li Ibrahim Kurash Fengqin Liu Yabo Xu |
| Affiliation: | a Department of Physics, Zhejiang University, Yugu road 20, Hangzhou 310027, PR China b Laboratory of Synchrotron Radiation, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, PR China |
| Abstract: | Photoemission studies reveal the existences of metallic Rb4C60 and Rb5C60 surface phases on the top layer of C60 single crystal. After Rb3C60 thin film with thickness of nanometers has formed on the (1 1 1) surface layers of the C60 single crystal, the excess deposition of Rb atoms do not induce the bulk-like face-centered cubic to body-centered tetragonal or body-centered cubic structure transitions at room temperature. The large size of C60 molecule offers the surface vacancies for the formation of Rb4C60 and Rb5C60 monolayer that is further verified by Rb 3d core-level photoemission measurements. Valence band photoemission results exhibit the surface phases are metallic. |
| Keywords: | Metallic surfaces Fullerenes Single crystal surfaces Photoemission (total yield) Alkali metals |
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