Growth and Physical Properties Measurements of Novel Condensed Matter Materials

新型凝聚态材料的生长和物理性能测量

• 批准号: 0504769
• 负责人: John Neumeier
• 金额: --
• 依托单位: Montana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0504769&HistoricalAwards=false
• 关键词: Growth; Physical; Properties; Measurements; Novel

Non Technical AbstractScience and technology in the coming decades will increasingly rely on novel magnetic and superconducting compounds. This research focuses on the search for new compounds and the investigation of existing novel compounds. A unique device for measuring the thermal expansion will be employed that has a relative resolution 10,000 times better than existing techniques. These high-resolution data will reveal information about the structural and magnetic transitions that will expand our fundamental understanding of novel solids. Improvement of the thermal expansion device will be pursued over the project's duration. Magnetic, thermal, electrical transport and structural data will compliment the thermal expansion data and enable detailed theoretical analysis. Sample preparation, including single crystal growth, is integrated into the work. National and international collaborations widen the potential impact of the project by sharing samples, infrastructure, and expertise. The research enhances cultural diversity and human resources in science by providing educational opportunities for graduate, undergraduate and Native American high school students.Technical AbstractNovel condensed matter compounds which exhibit superconducting or magnetic behavior will be studied in this research. Thermal expansion, heat capacity, and magnetic measurements will allow extraction of the critical exponents associated with the thermodynamic phase transitions of some important magnetic compounds; this aspect involves close collaboration with a theorist and will lead to new analysis methods and improved understanding of critical phenomena in condensed matter systems. Thermal expansion measurements will be conducted on MgB2 and NaxCoO2 to reveal information regarding anisotropic coupling of the lattice to the unusual superconducting ground states as well as general structural information, but with a relative resolution exceeding that of x-ray or neutron diffraction by four orders of magnitude. Sample synthesis and single crystal growth projects are integrated into the work to search for new compounds with interesting magnetic and electrical properties. National and international collaborations widen the potential impact of the project by sharing samples, infrastructure, and expertise. The research enhances cultural diversity and human resources in science by providing educational opportunities for graduate, undergraduate and Native American high school students.

在未来的几十年里，科学技术将越来越依赖于新型的磁性和超导化合物。 本研究的重点是寻找新的化合物和现有的新化合物的调查。 将采用一种独特的装置来测量热膨胀，其相对分辨率比现有技术好10，000倍。 这些高分辨率数据将揭示有关结构和磁性转变的信息，这将扩大我们对新固体的基本理解。 在整个项目期间，将继续改进热膨胀装置。 磁、热、电传输和结构数据将补充热膨胀数据，并进行详细的理论分析。 样品制备，包括单晶生长，被集成到工作中。 国家和国际合作通过共享样本、基础设施和专业知识扩大了项目的潜在影响。 该研究通过为研究生、本科生和美国原住民高中生提供教育机会，增强了科学领域的文化多样性和人力资源。 热膨胀，热容量和磁性测量将允许提取与一些重要的磁性化合物的热力学相变相关的临界指数;这方面涉及与理论家的密切合作，并将导致新的分析方法和改善对凝聚态系统中临界现象的理解。 热膨胀测量将进行MgB 2和NaxCoO 2，以揭示有关晶格的各向异性耦合到不寻常的超导基态以及一般的结构信息，但相对分辨率超过了X射线或中子衍射的四个数量级。 样品合成和单晶生长项目被整合到工作中，以寻找具有有趣的磁性和电学性质的新化合物。国家和国际合作通过共享样本、基础设施和专业知识扩大了项目的潜在影响。这项研究通过为研究生、本科生和美洲土著高中学生提供教育机会，增强了科学领域的文化多样性和人力资源。