Conductance and EPR study of the endohedral fullerene Li @C60

被引：30
作者：
Popok, VN
Azarko, II
Gromov, AV
Jönsson, M
Lassesson, A
Campbell, EEB
机构：
[1] Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden
[2] Belarusian State Univ, Fac Phys, Minsk 220050, BELARUS
[3] Ernst Moritz Arndt Univ Greifswald, Dept Phys, D-17491 Greifswald, Germany
来源：
SOLID STATE COMMUNICATIONS | 2005年 / 133卷 / 08期
关键词：
fullerene; electronic transport; electron paramagnetic resonance;
D O I：
10.1016/j.ssc.2004.12.014
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Thin films and bulk samples of endohedral fullerenes Li@C-60 are studied using current-voltage (I-V) measurements and electron paramagnetic resonance (EPR). Electrical measurements show a linear behaviour for the I-V curves and give an average resistivity of ca. 1.5 kOmegacm for thin Li@C-60 films deposited in vacuum, four orders of magnitude lower than C-60 samples. A drastic effect on the conductance, lowering it to the values typical for C-60, is observed when the Li@C-60 samples are exposed to ambient atmosphere. No additional paramagnetic centres (PCs) are found for the Li@C-60 compared to C-60 that can be related to the formation of dimers or trimers of the endohedral fullerene molecules. However, the presence of the Li atoms in the fullerene cages contributes to a change of the spin-spin and spin-lattice relaxation times. The spin-lattice relaxation time becomes four orders of magnitude longer compared to the spin-spin relaxation time. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：499 / 503
页数：5
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