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

页码：499 / 503

页数：5

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