Preparation of Prototype THz Device and Synthesis of Nanostrucured Excitonic Room Temperature Superconductor

利特尔和金兹伯格提出用激子进行低维输运系统作为室温超导的模型。在模型中，二维系统的候选导电层（主链）是金属。由于激子在金属中的屏蔽长度可能在nm量级，因此金属层必须是超薄且连续的。介电层（侧链）必须具有足够高的能量并与电子相互作用。我们研究了C_<60>-O-C_8SH衍生物（C_<60>-SAM）（作为介电层）在Au超薄膜（作为导电层）上作为激子超导体模型材料的自组装单层的导电性能。当使用金属掩膜时，电极是通过射频磁控溅射制成的，溅射的Au原子在掩膜孔后面通过。去除掩膜后，采用射频磁控溅射法制备了金超薄膜。样品在0.01mM的C_<60>衍生物苯溶液中室温浸泡20 h。从室温到125K，电阻呈线性下降，低于125K，梯度变陡。仅在电极距离小于10 μm的试样中观察到异常的导电行为。我们认为上述异常输运性质可能是由金属中的自由电子与分子中激发的电偶极子之间的激子相互作用的影响引起的。

Little and Ginzburg propose low dimensional transport systems by excitons as a model of a room temperature superconductivity. In the models, the candidate of conductive layer (the main chain) for the 2-dimensional system is a metal. Since the shielding length of the exciton in metals may be in the order of nm, the metal layer must be ultrathin and continuous. The dielectric layer (the side chain) must have enough high energy and interactions with electrons.We have studied the electrical conduction properties of the self-assembly monolayer of the C_<60>-O-C_8SH derivatives (C_<60>-SAM) (as dielectric layer) on Au ultrathin films (as conductive layer) as the model materials for an excitonic superconductor. When using the metal mask, electrodes were made by RF magnetron sputtering, sputtered Au atoms passed around behind the holes of the mask. After removing the mask Au ultrathin films were deposited by RF magnetron sputtering. The specimen was soaked in a 0.01mM benzene solution of C_<60> derivatives for 20 h at room temperature. The resistance decreased linearly from room temperature to 125K, and the gradient became steep lower than 125K. The unusual conductive behavior was observed only in the specimen which has an electrode distance less than 10 μm.We concluded that the above anomalous transport properties may be caused by the influence of excitonic interactions between free electrons in the metal and electric dipoles excited in the molecules.