Princeton/Exxon Experimental Studies of Organic Charge Transfer Salts

与有机电荷转移盐相关的场具有 在过去的几年里几乎爆炸了。 从单个 在-1K的压力下超导的材料， 现在有几个家族的化合物与Tc的高达12 K， 环境压力。 此外，这些都是漂亮的模型系统 研究大量新的物理现象， 一个组合的降维，相对较小 带宽和强的电子-电子相互作用。 他们有 在过去的资助期内， 这些材料在高磁环境中的显著特性 领域的 （TMTSF）2X化合物显示出独特的级联反应。 磁场诱导自旋密度波跃迁， 整数和分数量子霍尔效应的方面， SDW波长随磁场长度的可调性 以及底层晶格、朗道带和子带，以及新的 量子振荡的类型 虽然有快速的 在这个领域的理论发展，一些最近的 实验和新的理论表明， 值得注意的现象。 因此，他们建议进一步研究磁场 使用不同的化合物和额外的探针。 他们 我还计划对这种新的有机物进行一系列实验 超导体来阐明超导性的本质， 以及相关性、维度和 disorder. 这项工作的一个重要组成部分是高合成 优质单晶。 我们过去的研究 在埃克森美孚的指导下， 李博士Chaing。 这项工作将继续下去，并将扩大到 开发和表征新材料， 建立的。

The field associated with organic charge transfer salts has virtually exploded within the past several years. From a single material which was superconducting at - 1K under pressure, there are now several families of compounds with Tc's up to 12K at ambient pressure. In addition, these are beautiful model systems for studying a wealth of new physical phenomena which result from a combination of reduced dimensionality, relatively small bandwidths and strong electron-electron interactions. They have been most active in the past grant period in the investigations of the remarkable properties of these materials in high magnetic fields. The (TMTSF)2X compounds show a unique cascade of magnetic field induced spin density wave transitions involving aspects of the integer and fractional Quantum Hall Effect, commensurability of the SDW wavelength with the magnetic length and the underlying lattice, Landau bands and subbands, and new types of quantum oscillations. Although there has been rapid theoretical development in this area, some of the more recent experiments and new theories suggest that there are still more interesting phenomena to be observed. They therefore propose a further study of the magnetic field effects using different compounds and additional probes. They also plan a series of experiments on the new organic superconductors to elucidate the nature of the superconductivity, and the roles played by correlations, dimensionality and disorder. A vital part of this work is the synthesis of high quality single crystals. Our past research was only made possible by the synthetic effort at Exxon under the direction of Dr. L.Y. Chaing. This effort will continue and be expanded to develop and characterize new materials as well as prepare established ones.