Electronic Properties of Thin Film Organic Superconductors Studied Using Synchrotron Radiation-Based Soft X-Ray Spectroscopies

该项目旨在合成有机超导体薄膜，并使用基于高分辨率同步辐射的软X射线能谱仪的强大组合来研究其电子性质。一个主要的目标是解决与早期单晶研究相关的束损伤和表面问题，方法是原位生长这些材料的薄膜，并随着光谱的记录在同步辐射光束前连续平移薄膜。有机分子束沉积方法将被用来原位合成有机超导体有序薄膜。将对薄膜有机超导体的态密度、能带结构、费米面和轨道成键进行决定性的测量。该项目将使学生和博士后研究助理接触到国家用户设施的高度协作的研究环境，从而对他们的教育产生重大影响。他们将学习新型有机材料的化学和物理，以及同步辐射光谱仪在他们研究中的应用。这是一个雄心勃勃的计划，旨在对有机超导体的表面和整体电子结构进行确定的测量。%的超导体是令人着迷的材料，在适当的条件下，可以没有电阻地携带电流。虽然大多数超导体是无机材料，如金属，但也有一些是有机的，即碳基。这些有机超导体是复杂的材料，其性质尚不清楚。有机超导体的薄膜还没有被常规地合成，这将是一个重大的挑战。这些材料的基本电子性质将用两个探测器来研究：光电子能谱和X射线发射能谱。这些探测器包括通过强烈的x射线照射激发材料中的电子并测量它们的响应。光谱的这种组合将提供对这些复杂材料的电子和化学性质的全面了解。该课程还将培养博士后研究助理、研究生和本科生在有机超导体的物理和化学方面的知识，以及在他们的研究中应用最先进的光谱探测器。这门电子材料课程对产业界有很高的兴趣，在这些领域接受培训的学生将在就业市场上具有很强的竞争力。

The project aims to synthesize thin films of organic superconductors and to study their electronic properties using a powerful combination of high resolution synchrotron radiation-based soft x-ray spectroscopies. A major goal is to solve the beam damage and surface problems associated with earlier studies of single crystals by growing thin films of these materials in-situ, and continuously translating the films in front of the synchrotron radiation beam as spectra are recorded. Organic molecular beam deposition methods will be developed for the in-situ synthesis of ordered thin films of organic superconductors. Definitive measurements will be made of the density of states, band structure, Fermi surfaces, and orbital bonding of thin film organic superconductors. This project will have a significant impact on the education of students and postdoctoral research associates by exposing them to a highly collaborative research environment at national user facilities. They will be educated in the chemistry and physics of novel organic materials, and in the application of synchrotron radiation spectroscopies in their study. This is an ambitious program that aims to produce definitive measurements of surface and bulk electronic structure of organic superconductors.%%%Superconductors are fascinating materials that, under appropriate conditions, can carry an electrical current with no resistance. While most superconductors are inorganic materials such as metals, there are some that are organic, i.e., carbon-based. These organic superconductors are complex materials whose properties are not well understood. Thin films of organic superconductors have not been routinely synthesized, and this will be a major challenge. The basic electronic properties of these materials will be studied using two probes: photoemission spectroscopy and x-ray emission spectroscopy. These probes involve the excitation of the electrons in the material by illumination with intense x-rays and measuring their response. This combination of spectroscopies will provide a comprehensive understanding of the electronic and chemical properties of these complex materials. This program will also educate postdoctoral research associates, graduate and undergraduate students in the physics and chemistry of organic superconductors, and the application of state of the art spectroscopic probes in their study. This class of electronic materials is of high interest to industry, and students trained in these areas will be very competitive in the job market.