Comparative photoemission study of RbxC60, RbxC70 and RbC8: A pseudo-gap at the Fermi level in the fulleride

✍ Scribed by T. Takahashi; T. Morikawa; S. Hasegawa; K. Kamiya; H. Fujimoto; S. Hino; K. Seki; H. Katayama-Yoshida; H. Inokuchi; K. Kikuchi; S. Suzuki; K. Ikemoto; Y. Achiba

• Book ID: 103945925
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 604 KB
• Volume: 190
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90596-5

✦ Synopsis

A comparative photoemission study on Rb,C6o. Rb.,C7o and RbC8 (graphite intercalation compound ) is reported. It was found that the Fermi level of Rb3C6o is located at the bottom of a valley of the density of states, while that of RbC8 is at a maximum point of the occupied states. This experimental result is explained in terms of the existence of a pseudo-gap at the Fermi level in the fulleride. This indicates that a rigid-band picture is not a good starting point for understanding the change of the electronic structure upon the alkaline-doping. It was also found that the density of states at the Fermi level is much smaller in Rb,CTo than in Rb ~C6o. This accounts for the less conductive nature and the absence of superconductivity in Rb,CTo.