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

1.通过直流区、交流区和光学区的电导测量，研究了bis(ethylenedithio)-tetrathiafulvalene(BEDT-TTF或Et基有机导体的电导率。(1)用电化学方法合成了几种Et阳离子自由基盐，并测量了它们的电导。(2)(Et)_2[Cu(NCS)_2]盐是常压有机超导体，其T=10.4K，是迄今发现的有机化合物中T最高的。(3)在Et的CoCl4^&lt；2-gt；和MuCl4^&lt；2-gt；盐中发现了显著的巡回电子自旋和定域电子自旋之间的磁相互作用。此外，还利用反射式微波腔构成了电导率和介电常数的测量装置，使测量在4-300K温度范围内无电极接触变得容易。

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.