Studies of Correlated Electron Effects in Anisotropic Metals and Superconductors

本实验研究项目主要关注高各向异性材料的相关电子性质，包括有机超导体和氧化钼青铜。高度相关的电子性质包括自旋密度波、电荷密度波、量子霍尔效应和多阶参数超导性。实验利用高磁场，获得在一个独特的内部脉冲磁场设施，以及在NHMFL。这些研究还使用了高压和低温。高磁场部分用于淬灭超导或其他相关电子状态，允许观察量子振荡和其他效应来探测费米表面。除了测量电子输运特性外，还测量了射频穿透深度。这项基础研究的结果可能包括基本的新物理效应，也可能为包括半导体微电子器件在内的其他系统中的电子行为提供见解。这个高度跨学科的项目涉及研究生，他们在两个实验室进行论文研究，并接受对未来在工业，政府或学术界的职业生涯有益的优秀培训。这个实验研究项目的重点是不寻常的和潜在有用的电子导电材料，它与铜和银等普通金属在两个主要方面不同。首先，它们是由有机分子或金属氧化物组成的。其次，它们在不同方向上的导电性非常不同。在这些材料中，电子传导的各向异性倾向于一个特定的方向，因此它们是“一维的”；在其他情况下，存在高导电性的平面，这是一个“二维”导体。电子在这些条件下的行为通常是不寻常的，而这种不寻常的行为及其原因是研究的主题。在这个项目中感兴趣的材料主要是有机超导体和氧化钼青铜。测量的特点是高磁场，在一个独特的内部脉冲磁场设施，以及在美国国家科学基金会支持的国家高磁场实验室（NHMFL）位于佛罗里达州立大学。测量还具有使用高压和低温的特点。这项基础研究的结果可能包括基本的新物理效应，也可能为包括半导体微电子器件在内的其他系统中的电子行为提供见解。这个高度跨学科的项目涉及研究生，他们在两个实验室进行论文研究，并接受对未来在工业，政府或学术界的职业生涯有益的优秀培训。＊＊＊

08/29/95 2 9805784 Agosta This experimental research project focuses on the correlated electron properties of highly anisotropic materials, including organic superconductors and molybdenum oxide bronzes. Highly correlated electron properties of interest include spin density waves, charge density waves, the quantum Hall effect and multiple order parameter superconductivity. The experiments utilize high magnetic fields, obtained at a unique in-house pulsed magnetic field facility, as well as at NHMFL. The studies also feature use of high pressure and low temperature. High magnetic field is used in part to quench the superconducting or other correlated electron state, allowing observation of quantum oscillations and other effects to probe the Fermi surface. The RF penetration depth is measured in addition to electronic transport properties. The results from this basic investigation may include fundamental new physical effects and also may provide insight into electron behavior in other systems including semiconductor microelectronic devices.This highly interdisciplinary project involves graduate students who pursue thesis research at both laboratory locations, and receive excellent training beneficial to a future career in industry, government or academia. %%% This experimental research project focuses on unusual and potentially useful electronic conducting materials, which differ from common metals such as copper and silver in two major respects. First, the are composed of organic molecules, or oxides of metals. Second, they have very different electrical conduction in different directions. The anisotropy of the electron conduction in some of these materials tends to favor one particular direction, so they are "one-dimensional"; in other cases planes are present which are highly conductive, and this is a "two-dimensional" conductor. The behavior of electrons under these conditions is often unusual, and this unusual behavior and the reasons for it are the topic of the research. The materials of interest in this project are mostly organic superconductors and molybdenum oxide bronzes. Measurements feature high magnetic fields, obtained at a unique in-house pulsed magnetic field facility, as well as at the NSF-supported National High Magnetic Field Laboratory (NHMFL) located at Florida State University. Measurements also feature use of high pressure and low temperature. The results from this basic investigation may include fundamental new physical effects and also may provide insight into electron behavior in other systems including semiconductor microelectronic devices. This highly interdisciplinary project involves graduate students who pursue thesis research at both laboratory locations, and receive excellent training beneficial to a future career in industry, government or academia. ***