Valence state of Eu ions in C60 fullerides

被引：5
|
作者：
Wang, Xiao-Xiong [1 ,2 ]
Li, Hong-Nian [1 ]
Xu, Ya-Bo [1 ]
机构：
[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China
[2] Nanjing Univ Sci & Technol, Coll Sci, Nanjing 210094, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2008年 / 147卷 / 11-12期
基金：
中国国家自然科学基金;
关键词：
Eu-doped C-60; Eu6C60; valence state; photoelectron spectroscopy;
D O I：
10.1016/j.ssc.2008.07.004
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have prepared Eu-intercalated C-60 films in ultra-high vacuum, With special attention to avoid oxygen contamination. X-ray photoelectron spectra were measured in situ. Eu 4f photoemission reveals that the valence state of Eu ions is divalent for all intercalation levels. C 1s photoemission exhibits evidence of both ionic and covalent contributions to the Eu-C-60 bonding. The results eliminate the controversy about the valence state of Eu ions in the literature, and can help to understand the ferromagnetism (FM) and the giant magnetoresistance (GMR) of Eu6C60. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：436 / 438
页数：3
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