Emergent Collective Phenomena in Transition Metal Oxides

过渡金属氧化物中出现的集体现象

• 批准号: 0903977
• 负责人: Seung-hun Lee
• 金额: $ 32.4万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0903977&HistoricalAwards=false
• 关键词: Emergent; Collective; Phenomena; Transition; Metal

****TECHNICAL ABSTRACT****This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Complex oxides provide numerous opportunities to study novel electronic, magnetic, and struc-tural phenomena that emerge out of strong interactions between electrons, such as high Tc su-perconductivity, quantum spin liquid states, and magneto-electricity. Understanding their under-lying microscopic mechanisms as well as exploring their rich phase diagrams poses grand challenges in condensed matter physics. This individual investigator award supports a project to study several exemplary transition metal oxides to address some fundamental questions, especially focusing on how the relevant degrees of freedom, such as spin, charge, and lattice, are coupled to induce the aforementioned complex properties. Of particular interest are the exploration of possible new phases and quantum phase transitions in quantum and frustrated magnets, examination of electron-phonon coupling in high Tc superconductors, and testing conflicting theoretical models in magnetic multiferroics. Elastic/inelastic neutron scattering techniques that directly probe static and dynamic properties of solid at the atomic length scale will be employed. Undergraduate and graduate students will spend time at several internationally top research institutes in the U.S., Europe, and Japan for crystal growth and neutron scattering measurements.****NON-TECHNICAL ABSTRACT****This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). An electron is an elementary particle that carries electric charge and spin (magnetic moment). Abundant in a solid, electrons can interact strongly with each other to bring about novel phenomena when certain conditions are met. Well-known examples of the collective behaviors in strongly correlated electron systems are superconductivity that leads to magnetic levitation and multiferroicity that allows one to control magnetic and electronic properties simultaneously, both of which have potential revolutionary industrial applications. This project will address key issues regarding these phenomena by investigating several exemplary complex oxides. The outcome will advance our understanding of how the spin, charge and crystal lattice are correlated to cause such effects. The research will provide important information on how to better engineer the properties for future technical applications. Undergraduate and graduate students will be trained in state-of-the-art crystal growth and characterization techniques at several international top research institutes, and will have opportunities to develop their own international research network.

****技术摘要****该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。复杂的氧化物提供了许多研究新型电子，磁性和结构性现象的机会，这些现象是从电子之间的强烈相互作用（例如高TC Su-Percoductivity，量子自旋液态和磁性电力）中出现的。了解其底层微观机制以及探索其丰富相图会在凝结物理学中构成巨大的挑战。该个体研究者奖支持一个项目，该项目研究了一些示例性过渡金属氧化物，以解决一些基本问题，尤其是关注相关自由度（例如自旋，电荷和格子）如何诱导上述复杂性能。特别令人感兴趣的是探索量子和挫折磁体中可能的新阶段和量子相变，在高TC超导体中检查电子 - 音波耦合，并测试磁性多表情中的理论模型冲突。将采用弹性/非弹性中子散射技术，这些技术将采用直接探测原子长度尺度固体的静态和动态特性。本科生和研究生将在美国，欧洲和日本的几家国际顶级研究机构花费时间来进行水晶的增长和中子散射测量。电子是带有电荷和自旋（磁矩）的基本粒子。在固体中丰富，电子可以在满足某些条件时相互互动，从而产生新现象。强烈相关的电子系统中集体行为的众所周知的例子是超导性，导致磁性悬浮和多效性，使人们可以同时控制磁性和电子特性，它们都具有潜在的革命工业应用。该项目将通过研究几种示例性的复杂氧化物来解决有关这些现象的关键问题。结果将提高我们对自旋，电荷和晶格如何相关的理解以引起这种影响。该研究将提供有关如何更好地设计未来技术应用程序的属性的重要信息。本科生和研究生将在几家国际顶级研究机构的最先进的水晶增长和特征技术中接受培训，并将有机会开发自己的国际研究网络。