Metal-insulator transition in iodinated amorphous conducting carbon films

被引：16
|
作者：
Kumari, L [1 ]
Subramanyam, S
Eto, S
Takai, K
Enoki, T
机构：
[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India
[2] Tokyo Inst Technol, Dept Chem, Meguro Ku, Tokyo 1528551, Japan
来源：
CARBON | 2004年 / 42卷 / 11期
基金：
日本学术振兴会;
关键词：
carbon films; intercalation; pyrolysis; transport properties;
D O I：
10.1016/j.carbon.2004.04.019
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, the effect of iodine incorporation on the electrical conductivity, magnetic susceptibility (chi) and magnetoresistance (MR) of amorphous conducting carbon (a-C) films has been discussed. Variation in conductivity of a-C films depends on the sample preparation conditions and iodine concentration. Evidence of metal-insulator (M-I) transition as a function of pyrolysis temperature is observed for iodinated (a-C:I) samples. The temperature dependent magnetic susceptibility of a-C:I sample shows a Curie behavior at low temperatures. The positive magnetoresistance is observed for all the samples irrespective of the conduction regimes. This is accounted by the electron-electron interaction in the a-C:I system. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2133 / 2137
页数：5
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