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*本奖项由《2009年美国复苏和再投资法案》(公法111-5)资助。复合氧化物为研究电子之间强相互作用产生的新的电子、磁性和结构现象提供了许多机会，如高T_c超导性、量子自旋液态和磁电。了解它们背后的微观机制以及探索它们丰富的相图，在凝聚态物理学中提出了巨大的挑战。这一个人研究人员奖支持一个项目，研究几种典型的过渡金属氧化物，以解决一些基本问题，特别是关注相关的自由度，如自旋、电荷和晶格，是如何耦合而导致上述复杂性质的。特别令人感兴趣的是探索量子磁体和受阻磁体中可能的新相和量子相变，检查高T_c超导体中的电子-声子耦合，以及检验磁性多铁体中相互矛盾的理论模型。将采用弹性/非弹性中子散射技术，在原子长度尺度上直接探测固体的静态和动态性质。本科生和研究生将在美国、欧洲和日本的几个国际顶尖研究机构花费时间进行晶体生长和中子散射测量。*非技术摘要*该奖项由2009年美国复苏和再投资法案(公共法律111-5)资助。电子是携带电荷和自旋(磁矩)的基本粒子。固体中含有丰富的电子，当满足某些条件时，电子可以相互强烈相互作用，产生新的现象。强关联电子系统中集体行为的著名例子是导致磁悬浮的超导性和允许人们同时控制磁和电子性质的多铁性，这两者都具有潜在的革命性工业应用。该项目将通过研究几种典型的复杂氧化物来解决与这些现象有关的关键问题。这一结果将促进我们对自旋、电荷和晶格如何关联导致这种效应的理解。这项研究将为如何更好地为未来的技术应用设计性能提供重要信息。本科生和研究生将在几个国际顶尖研究机构接受最先进的晶体生长和表征技术培训，并将有机会发展自己的国际研究网络。