双壁碳纳米管束中的磁有序和超导电性
Magnetic order and superconductivity observed in bundles of Double-Wall Carbon Nanotubes
摘要：
研究了数百个微米长的双壁碳纳米管束的磁输运性质。在15 K以上，电阻表现出欧姆行为，其温度依赖性很好地描述了一维系统的可变范围跳跃。的磁阻是负的，可以解释使用的经验模型的基础上自旋散射过程表明存在磁秩序到室温。在2 K和15 K之间的温度下的电阻是非欧姆和电流-电压特性揭示了一个潜在的外观，这可以很好地描述了由波动引起的隧道导电模型。在这个低温范围内，在足够低的输入电流下，除了负的磁电阻之外，还出现了正的磁电阻，并且在磁场中具有异常的磁滞，并且在$T \sim 15 $ K处消失，这表明存在超导状态。磁化结果部分支持DWCNT束中这两种现象的存在。
英文摘要：
The magnetotransport properties were studied in hundreds of micrometer length double-wall carbon nanotubes (DWCNT) bundles. Above 15 K the resistance shows an ohmic behavior and its temperature dependence is well described using the variable-range hopping for one-dimensional system. The magnetoresistance is negative and can be explained using an empirical model based on spin-scattering processes indicating the existence of magnetic order up to room temperature. At temperatures between 2 K and 15 K the resistance is non-ohmic and the current-voltage characteristics reveal the appearance of a potential, which can be well described by a fluctuation-induced tunneling conduction model. In this low temperature range and at low enough input current, a positive magnetoresistance appears - in addition to the negative one - with an extraordinary hysteresis in field and vanishes at $T \sim 15 $K, suggesting the existence of a superconducting state. Magnetization results partially support the existence of both phenomena in the DWCNT bundles.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
