EAGER: SUPER: Coupling High-Energy Phonons into High-Tc Superconductors

非技术性总结EAGER项目支持研究和教育活动，以在周期表上轻元素的帮助下创建更强大的超导体。超导性--固态材料中电能的无损传输--最常见的依赖于由于原子振动提供的吸引力而形成的电子对。在大多数大块超导体中，这种振动太慢，无法在日常温度下保持电子配对-大量电子几乎没有胶水。含有轻元素的化合物自然包含最快的原子振动，但高振动性的性质也阻止了稳定、紧凑的晶格的形成，这种晶格可以导电--大量的胶水和少量的电子。EAGER项目的主要目标是使用先进的合成方法来创造一个稳定、紧凑的晶格，其中富含氢、碳和锂等轻元素。这将同时提供足够的电子和配对胶，从而增强超导性以适应环境条件。一种方法是通过选择性的大分子嵌入在现有的层状块状超导体中产生优选的轻元素占据位置。另一种是在轻元件衬底上逐层生长高温超导体。这两种方法的目的都是在现有的超导电子附近创建轻元素的原子限制。该项目支持三名研究生的教育，在合成，表征和理论的整个周期内紧密合作。直观的、一般的概念教学法是大学物理高年级课程中一个重要的教学范例。该项目还提供了现代材料设计管道的演示，将用于开发本科生和公立学校学生的研究项目。技术总结EAGER项目支持研究和教育活动，调查可能使用轻元素的高频声子来提高现有高温超导体的超导性。特别是，富含锂和氢的化合物将用于提高铜基和铁基超导体的转变温度和临界超导电流。与传统方法不同，传统方法通常会导致不受控制的轻元素放置和对处理材料的结构损伤，该项目旨在通过i）掺杂剂辅助的轻元素嵌入体材料中以及ii）薄膜超导体中的轻元素衬底增强超导性来更好地调节该过程。第一种方法通过选择性的大分子嵌入在现有的层状块状超导体中产生优选的轻元素占据位点。另一种方法的目标是在轻型元件衬底上逐层生长高温超导体。在实践中，通过这两种方法，将产生具有富集的轻元素组成的高度有序的固态结构，并在环境条件下稳定。该项目研究了“混合”超导性的一般框架的有效性，通过有针对性地组合有利的超导贡献者-强配对和强传导来实现。所提出的散装和薄膜合成相互补充的可调谐性和适用的表征方法。该项目支持三名研究生的教育，在合成，表征和理论的整个周期内紧密合作。直观的、一般的概念教学法是大学物理高年级课程中一个重要的教学范例。该项目还提供了现代材料设计管道的示范，将用于开发本科生和公立学校学生的研究项目。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

NONTECHNICAL SUMMARYThis EAGER project supports research and education activities to create a more robust superconductor with the help from light elements on the periodic table. Superconductivity - the lossless transmission of electricity in a solid-state material - most commonly relies on the formation of electron pairs due to an attraction provided by atomic vibrations. In most bulk superconductors, this vibration is too slow to maintain the electron pairing at everyday temperatures - lots of electrons with little glue. Compounds with light elements naturally contain the fastest atomic vibrations, but the highly vibrative nature also prevents the formation of a stable, compact crystal lattice that can conduct electricity - a lot of glue with few electrons.The main goal of this EAGER project is to use advanced synthesis to create a stable and compact crystal lattice enriched with light elements such as hydrogen, carbon and lithium. This would provide both sufficient electrons and pairing glue simultaneously, therefore strengthening superconductivity to weather ambient conditions. One way is to create preferred light-element occupation sites in existing layered bulk superconductors via selected large molecule intercalation. The other is to grow high-temperature superconductors on light-element substrates layer-by-layer. Both methods are aimed to create atomic confinement of light elements in proximity to pre-existing superconducting electrons.This project supports the education of three graduate students, cohesively working across the full cycle of synthesis, characterization and theory. The intuitive and generic conceptual approach is to be developed as an important teaching example in upper division college physics curriculum. This project also offers a demonstration of the modern materials design pipeline, which will be used to develop research projects of undergraduate and public-school students.TECHNICAL SUMMARYThis EAGER project supports research and education activities that investigate the possible use of high-frequency phonons from light elements to boost superconductivity in existing high-temperature superconductors. In particular, lithium and hydrogen rich compounds will be used to boost the transition temperature and critical supercurrent of copper- and iron-based superconductors. Unlike traditional methods, which often result in uncontrolled light element placement and structural damage to the treated material, this project aims to better regulate the process with i) a dopant-assisted light-element intercalation in bulk materials, and ii) light element substrate-enhanced superconductivity in thin film superconductors. The first method creates preferred light-element occupation sites in existing layered bulk superconductors via selected large molecule intercalation. The other method aims to grow high-temperature superconductors on light-element substrates layer-by-layer. In practice, via both approaches, a highly ordered solid state structure with enriched light element composition is to be created and stabilized under ambient conditions. This project examines the effectiveness of the general framework of “hybrid” superconductivity, achieved via targeted combination of favorable superconducting contributors - strong pairing and strong conduction. The proposed bulk and thin-film synthesis complement each other in terms of tunability and applicable characterization methods. This project supports the education of three graduate students, cohesively working across the full cycle of synthesis, characterization and theory. The intuitive and generic conceptual approach is to be developed as an important teaching example in upper division college physics curriculum. This project also offers a demonstration of the modern materials design pipeline, which will be used to develop research projects of undergraduate and public-school students.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.