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

页码：2133 / 2137

页数：5

共 12 条

[1] Electrical measurements of iodine doped amorphous diamondlike films grown on silicon substrate [J].