Studies of High-Tc Superconductors and Molecular Materials under Extreme Hydrostatic Pressure

极端静水压下高温超导体和分子材料的研究

• 批准号: 0101809
• 负责人: James Schilling
• 金额: $ 36.68万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-15 至 2004-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0101809&HistoricalAwards=false
• 关键词: Studies; Tc; Superconductors; Molecular; Materials

Despite enormous efforts, high-temperature superconductors have yet to fulfill the vaunted expectations placed in them. There exists neither a good basic understanding of these materials, nor the ability to process them for many potential applications. Progress has been impeded by the complexity of the perovskite-like structure and the important influence of defects. This individual investigator award will fund a project to study the temperature- and pressure-activated defect relaxation processes in both bulk high-Tc materials and their grain boundaries. The knowledge gained will help develop strategies to optimize the superconducting properties, in particular the current carrying capacity, and stabilize them for long-term applications. In addition, by suppressing the relaxation processes in a low-temperature experiment, the intrinsic dependence of Tc on pressure will be determined over a broad range of lattice parameter and carrier concentration, thus allowing a meaningful test of theory and perhaps pointing the way to higher values of Tc. High-pressure experiments on molecular magnets and superconductors are also planned. The research will involve a collaboration with a Russian scientist. Graduate and undergraduate students working on this project will benefit from the exposure to international collaborations as well as learn skills that will prepare them for future scientific careers.%%%High-temperature superconductors have yet to fulfill the vaunted expectations placed in them after their discovery nearly 15 years ago. Only a few specialized applications have reached the marketplace. Progress has been impeded by the complicated structure of these materials and the presence of many kinds of structural defects. Some of these defects can even migrate around at room temperature, thus degrading important properties, such as the current carrying capacity. This individual investigator award will fund a project to study the properties of mobile defects and try to develop a strategy to prevent their migration. This will open the door to further applications and also permit a better understanding of why these materials are superconducting at such high temperatures and perhaps point the way toward superconductivity at much higher temperatures. The research will involve a collaboration with a Russian scientist. Graduate and undergraduate students working on this project will benefit from the exposure to international collaborations as well as learn skills that will prepare them for future scientific careers.***

尽管付出了巨大的努力，高温超导体还没有实现人们对它们的期望。对这些材料既没有很好的基本了解，也没有能力将它们加工成许多潜在的应用。类钙钛矿结构的复杂性和缺陷的重要影响阻碍了进展。该个人研究者奖将资助一个项目，研究温度和压力激活的高tc块状材料及其晶界的缺陷松弛过程。所获得的知识将有助于制定优化超导性能的策略，特别是电流承载能力，并稳定它们的长期应用。此外，通过在低温实验中抑制弛豫过程，Tc对压力的内在依赖性将在广泛的晶格参数和载流子浓度范围内确定，从而允许有意义的理论测试，并可能指出更高Tc值的方法。分子磁体和超导体的高压实验也在计划之中。这项研究将涉及与一位俄罗斯科学家的合作。参与该项目的研究生和本科生将受益于国际合作，并学习为未来科学事业做好准备的技能。高温超导体在近15年前被发现后，还没有实现人们对它的过高期望。只有少数专门的应用程序进入了市场。这些材料的复杂结构和各种结构缺陷的存在阻碍了研究的进展。其中一些缺陷甚至可以在室温下迁移，从而降低重要的性能，例如载流能力。这个个人研究者奖将资助一个项目来研究可移动缺陷的特性，并尝试开发一种策略来阻止它们的迁移。这将为进一步的应用打开大门，也可以更好地理解为什么这些材料在如此高的温度下具有超导性，并可能为在更高的温度下实现超导性指明道路。这项研究将涉及与一位俄罗斯科学家的合作。参与该项目的研究生和本科生将受益于国际合作，并学习技能，为他们未来的科学事业做好准备