Electrical conductivity and dielectric constant of organic crystals in high frequency region

1.通过在直流、交流和光学区域的电导率测量，研究了基于双（亚乙基二硫）-四硫富瓦烯（BEDT-TTF或ET）的有机导体的电导率。(1)本文用电化学方法合成了几种ET阳离子自由基与AuI_2抗衡阴离子的盐，并测定了它们的电导率。一个新的修改，表现出金属-绝缘体转变，已被发现。(2)（ET）_2 [Cu（NCS）_2]盐是一种常压有机超导体，其T = 10.4K，是迄今为止在有机物中发现的最高T。(3)在ET的CoCl_4 ~+和MuCl_4 ~+盐中发现了明显的巡游电子自旋和局域电子自旋之间的磁相互作用<2-><2->，至少前者是有机导体.此外，还研制了一种反射式微波谐振腔测量电导率和介电常数的装置，该装置可在4 ~ 300 K温度范围内进行无电极接触的测量。

1. The electrical conductivity of organic conductors based on bis(ethylenedithio)-tetrathiafulvalene(BEDT-TTF or ET) has been studied by conductivity measurements in the dc, ac, and optical regions.(1) Several ET cation radical salts with the counter anion of AuI_2 are synthesized electrochemically and their electrical conductivities are measured. A new modification, exhibiting a metal-insulator transition, has been found.(2) The (ET)_2 [Cu(NCS)_2] salt has been found to be an ambient-pressure organic superconductor, which has T = 10.4 K, the highest T so far found in organics.(3) Prominent magnetic interaction between itinerant electron spins and localized electron spins has been found in the CoCl_4^<2-> and MuCl_4^<2-> salts of ET, at least the former being an organic conductor.2. In addition, an apparatus for conductivity and dielectric constant measurements had been constructed using a reflection type microwave cavity, which facilitates the measurements without electrode contacts and in the temperature region of 4 - 300 K.