CAREER: Correlations Between Local Structure and Electron Transport in Transition-Metal Oxides

职业：过渡金属氧化物中局域结构与电子传输之间的相关性

• 批准号: 9733862
• 负责人: Trevor Tyson
• 金额: $ 30万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9733862&HistoricalAwards=false
• 关键词: CAREER; Correlations; Between; Local; Structure

9733862 Tyson This is a CAREER award to an African-American scientist at an urban university with a large enrollment of students from underrepresented groups. The project will study high temperature superconducting materials such as yttrium barium copper oxide (YBCO), and its praseodymium- and terbium-doped variants. The critical temperature and ground state resistivity of YBCO are altered significantly by exposure to optical radiation (photodoping), by application external of pressure, by changes in the oxygen content and by the replacement of yttrium by praseodymium or terbium. However, the relation of these changes in electron transport to local local atomic order is poorly understood. The project addresses this issue by correlating transport properties with changes in the local structure of oriented bulk materials, oriented films and single crystals as determined by x-ray absorption spectroscopy. This should provide fundamental information about the superconducting state in these multinary oxide materials. The project will integrate work at NJIT laboratories with off-site research at national synchrotron light laboratories. Graduate, undergraduate, and high school students will conduct the research. The educational component of the project will expose undergraduates, high school students and teachers to modern research techniques. The PI is developing a research and teaching program targeted at Newark area high school students and NJIT undergraduates. It involves an undergraduate laboratory with advanced experimental methods and techniques, which link basic science training with research on transition metal oxides. %%% This is a CAREER award to an African-American scientist at an urban university with a large enrollment of students from underrepresented groups. The research will investigate the atomic structure in several high-temperature supercon ductor materials. Among other applications, these materials show promise to lead to low-loss power transmission lines at temperatures approaching room temperature. The mechanism for superconductivity in these materials is still not understood. To shed light on this problem, the project attempts to determine what atomic structural characteristics are correlated with the superconductivity and other transport properties in these materials. The research program integrates work at NJIT with off-site reserach at national research laboratories, such as synchrotron light sources. Graduate, undergraduate, and high school students will conduct the research. The educational component of the project will expose undergraduates, high school students and teachers to modern research techniques. The PI is developing a research and teaching program targeted at Newark area high school students and NJIT undergraduates. It involves an undergraduate laboratory with advanced experimental methods and techniques, which link basic science training with research on transition metal oxides. ***

这是颁发给一所城市大学的非裔美国科学家的职业成就奖，该大学招收了大量来自弱势群体的学生。该项目将研究高温超导材料，如钇钡铜氧化物（YBCO）及其镨和铽掺杂变体。YBCO的临界温度和基态电阻率会因光辐射（光掺杂）、外部压力、氧含量的变化以及用镨或铽取代钇而显著改变。然而，这些电子传递的变化与局部原子秩序的关系却知之甚少。该项目通过x射线吸收光谱测定的定向块状材料、定向薄膜和单晶的局部结构变化与输运特性的关联来解决这个问题。这将为这些多氧化物材料的超导态提供基本信息。该项目将整合NJIT实验室的工作和国家同步加速器光实验室的非现场研究。研究生、本科生和高中生将进行研究。该项目的教育部分将使本科生、高中生和教师接触到现代研究技术。PI正在开发一项针对纽瓦克地区高中生和新泽西理工大学本科生的研究和教学计划。它包括一个具有先进实验方法和技术的本科生实验室，将基础科学训练与过渡金属氧化物的研究联系起来。这是一项职业成就奖，授予一所城市大学的非裔美国科学家，该大学招收了大量来自代表性不足群体的学生。本研究将探讨几种高温超导体材料的原子结构。在其他应用中，这些材料有望在接近室温的温度下实现低损耗输电线路。这些材料的超导机制仍不清楚。为了阐明这个问题，该项目试图确定哪些原子结构特征与这些材料中的超导性和其他输运性质相关。该研究项目将新泽西理工大学的工作与国家研究实验室的非现场研究相结合，如同步加速器光源。研究生、本科生和高中生将进行研究。该项目的教育部分将使本科生、高中生和教师接触到现代研究技术。PI正在开发一项针对纽瓦克地区高中生和新泽西理工大学本科生的研究和教学计划。它包括一个具有先进实验方法和技术的本科生实验室，将基础科学训练与过渡金属氧化物的研究联系起来。＊＊＊