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

Little和Ginzburg提出了激子的低维输运系统作为室温超导的模型。在模型中，二维系统的导电层（主链）的候选者是金属。由于金属中激子的屏蔽长度可以是nm量级，因此金属层必须是连续的。电介质层（侧链）必须具有足够高的能量和与电子的相互作用，我们研究了C_<60>-O-C_8 SH衍生物（C_<60>-SAM）（作为电介质层）在Au薄膜（作为导电层）上的自组装单分子膜（作为激子超导体的模型材料）的导电性质。当使用金属掩模时，电极通过RF磁控溅射制成，溅射的Au原子在掩模的孔后面通过。去除掩模后，用射频磁控溅射法沉积Au薄膜。将样品在室温下浸泡在0.01mM的苯溶液中<60>20 h。电阻从室温到125 K呈线性下降，低于125 K时，电阻梯度变陡。只有电极间距小于10 μm的样品才能观察到这种反常的导电行为.我们认为，上述反常的输运性质可能是由于金属中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.

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.