Metal-Insulator transition in iodinated amorphous conducting carbon films
Metal-Insulator transition in iodinated amorphous conducting carbon films
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DOI：
10.1016/j.carbon.2004.04.019
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发表时间：
2004
期刊：
影响因子：
10.9
通讯作者：
L. Kumari;S. Subramanyam;S. Eto;K. Takai;T. Enoki
中科院分区：
文献类型：
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作者：
L. Kumari;S. Subramanyam;S. Eto;K. Takai;T. Enoki
本文讨论了碘掺杂对非晶态导电碳(a-C)薄膜的电导率、磁化率(χ)和磁阻(MR)的影响。A-C膜电导率的变化取决于样品制备条件和碘浓度。对于加碘的(a-C：I)样品，观察到金属-绝缘体(M-I)转变作为热解温度的函数的证据。A-C：I样品的磁化率随温度的变化在低温下表现为居里行为。在所有样品中都观察到了正磁阻，而与导电区无关。这是由a-C：I系统中的电子-电子相互作用引起的。
In this work, the effect of iodine incorporation on the electrical conductivity, magnetic susceptibility (χ) 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.