氢化石墨纤维中电场诱导的奇异金属态和可能的高温超导性
Electric-field induced strange metal states and possible high-temperature superconductivity in hydrogenated graphitic fibers
摘要：
本文研究了增大外加电场强度对氢化石墨纤维电荷输运的影响。电阻率测量进行了直流电流在nA - mA范围内，温度从1.9 K到300 K。高温非欧姆电压-电流依赖性很好地描述了非线性随机电阻网络模型适用于系统，在所有尺度上是无序的。随温度变化的电阻率显示出线性的，从绝缘到金属状态的阶梯状转变以及平台的功能。随着更多的电流被提供，纤维变得更导电，因此电流密度上升。在高电场中观察到最有趣的特征。当光纤冷却时，电阻率首先随温度线性下降，然后在温度T？260？280 K，与场无关。这些对碳、氢、氮和氧原子组成的系统的观察表明，可能存在电场诱导的超导性，具有高临界温度，这是通过研究手性对生命起源的作用而预测的[1]。
英文摘要：
In this work, we have studied the effects from increasing the strength of the applied electric field on the charge transport of hydrogenated graphitic fibers. Resistivity measurements were carried out for direct currents in the nA - mA range and for temperatures from 1.9 K to 300 K. The high-temperature non-ohmic voltage-current dependence is well described by the nonlinear random resistor network model applied to systems that are disordered at all scales. The temperature-dependent resistivity shows linear, step-like transitions from insulating to metallic states as well as plateau features. As more current is being sourced, the fiber becomes more conductive and thus the current density goes up. The most interesting features is observed in high electric fields. As the fiber is cooled, the resistivity first decreases linearly with the temperature and then enters a plateau region at a temperature T ? 260 ? 280 K that is field-independent. These observations on a system made out of carbon, hydrogen, nitrogen, and oxygen atoms suggest possible electric-field induced superconductivity with a high critical temperature that was predicted from studying the role of chirality on the origin of life [1].
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