Open AccessValence band photoemission of Sm fullerides
Author(s) -
Xiaoxiong Wang,
Hong-Nian Li,
Qian Huang,
Run Su,
Jun Zhong,
Hong Chang,
Jiaou Wang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.4265
Subject(s) - photoemission spectroscopy , ultraviolet photoelectron spectroscopy , fermi level , x ray photoelectron spectroscopy , angle resolved photoemission spectroscopy , materials science , ionic bonding , inverse photoemission spectroscopy , superconductivity , synchrotron radiation , electronic structure , valence (chemistry) , doping , condensed matter physics , density of states , electron , atomic physics , chemistry , physics , nuclear magnetic resonance , ion , optoelectronics , organic chemistry , quantum mechanics
Valence band structure of Sm-intercalated C60 thin films is researched with ultraviolet photoelectron spectroscopy and synchrotron-radiation photoemission spectroscopy. Most valence electrons of Sm transfer to C60and the bonding nature is mainly ionic. No Fermi edge is observed for all stoichiometries. Thus the superconducting Sm fulleride has semiconducting property at room temperature. Density of states near the Fermi level is obtained for single phase of Sm2.75C60. Photoemission of the solid solution phase differs apparently from that of Sm2.75C60. SmxC60 (2.752.75C60 and Sm6C60, which indicates that another phase exists or Sm doping proceeds smoothly through the LUMO+1 band. The interfaces between different phases are unstable above 130 ℃.