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Conductance and EPR study of the endohedral fullerene Li @C-60

机译:内膜富勒烯@@ C-60的电导和EPR研究

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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.
机译:使用电流-电压(I-V)测量和电子顺磁共振(EPR)研究了内面富勒烯Li @ C-60的薄膜和大量样品。电气测量结果显示了I-V曲线的线性行为,并给出了平均电阻率ca。对于在真空中沉积的Li @ C-60薄膜,厚度为1.5 kOcmcm,比C-60样品低四个数量级。当Li @ C-60样品暴露于环境大气时,观察到对电导的剧烈影响,将其降低到C-60的典型值。与C-60相比,没有发现Li @ C-60的其他顺磁性中心(PC),这可能与内面富勒烯分子的二聚体或三聚体的形成有关。但是,在富勒烯笼中存在Li原子有助于改变自旋-自旋和自旋晶格的弛豫时间。与自旋-自旋弛豫时间相比,自旋-晶格弛豫时间变得更长四个数量级。 (C)2004 Elsevier Ltd.保留所有权利。

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