Neutron and X-Ray Scattering Study of Complex Oxides

复合氧化物的中子和 X 射线散射研究

• 批准号: 0405655
• 负责人: Martin Greven
• 金额: $ 33万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0405655&HistoricalAwards=false
• 关键词: Neutron; Ray; Scattering; Study; Complex

Complex oxides such as the high-Tc superconductors provide myriad possibilities to discover and study novel fundamental structural, magnetic and electronic phenomena and phases, and it is likely that only a small fraction of their scientific and technological potential has been realized so far. Neutron and x-ray scattering experiments play an invaluable role in this endeavor, as they yield essential structural and magnetic information about new phases of matter and the transitions between them. This individual investigator award supports a project involving crystal growth and scattering studies, as well as collaborations with experts using complementary experimental probes (such as photoemission, STM, optical spectroscopy, muSR and EXAFS), to address such timely questions as the nature of the electron-hole asymmetry in high-Tc superconductors and the role of disorder, phonons and coexisting or competing phases in these materials. The research is enabled by recent breakthroughs in the crystal growth of several pivotal materials, including the scantly-studied mercury-based compound Hg1201, the single Cu-O layer material with the highest value of Tc. Quantitative experiments on these materials are expected to become invaluable benchmarks for tests of theories. The extensive collaborations, enabled by the samples grown by the PI's undergraduate and graduate students, are anticipated to have a broad impact on the field. The PI's research at state-of-the-art x-ray and neutron facilities will offer valuable educational opportunities to train the next generation of materials physicists.Complex oxide materials such as the high transition temperature (high-Tc) superconductors provide myriad possibilities to discover and study novel fundamental structural, magnetic and electronic phenomena and phases, and it is likely that only a small fraction of their scientific and technological potential has been realized so far. Neutron and x-ray scattering experiments play an invaluable role in this endeavor, as they yield essential structural and magnetic information about new phases of matter and the transitions between them. Through crystal growth and scattering studies, as well as collaborations with experts using complementary experimental probes, this comprehensive project addresses unanswered questions relating to the superconductivity in the high-Tc superconductors. The research is enabled by recent breakthroughs in the crystal growth of several pivotal materials, including those with the highest values of Tc. Quantitative measurements are expected to become invaluable benchmarks for tests of theories. The extensive collaborations, enabled by the samples grown by undergraduate and graduate students, are anticipated to have a broad impact. Research at state-of-the-art x-ray and neutron facilities will offer valuable educational opportunities to train the next generation of materials physicists.

高Tc超导体等复杂氧化物为发现和研究新型基本结构、磁性和电子现象和相提供了无数可能性，但迄今为止，它们的科学和技术潜力很可能只实现了一小部分。中子和X射线散射实验在这一奋进中发挥了宝贵的作用，因为它们产生了关于物质新相及其之间过渡的基本结构和磁性信息。 这个个人研究者奖支持一个涉及晶体生长和散射研究的项目，以及与使用互补实验探针（如光电发射，STM，光谱学，muSR和EXAFS）的专家合作，以解决高Tc超导体中电子空穴不对称性的性质以及这些材料中无序，声子和共存或竞争相的作用等及时的问题。这项研究是通过最近几种关键材料的晶体生长取得的突破而实现的，包括很少研究的汞基化合物Hg 1201，这是一种具有最高Tc值的单一Cu-O层材料。对这些材料的定量实验有望成为检验理论的宝贵基准。PI的本科生和研究生培养的样本所实现的广泛合作，预计将对该领域产生广泛的影响。PI在最先进的X射线和中子设备上的研究将为培养下一代材料物理学家提供宝贵的教育机会。复杂的氧化物材料，如高转变温度（高Tc）超导体，为发现和研究新的基本结构、磁性和电子现象和相提供了无数的可能性，迄今为止，它们的科学和技术潜力很可能只实现了一小部分。中子和X射线散射实验在这一奋进中发挥了宝贵的作用，因为它们产生了关于物质新相及其之间过渡的基本结构和磁性信息。通过晶体生长和散射研究，以及与使用互补实验探针的专家合作，这个综合项目解决了与高温超导体中的超导性有关的未解答的问题。 这项研究是由最近在几种关键材料的晶体生长方面的突破所推动的，包括那些具有最高Tc值的材料。定量测量有望成为检验理论的无价基准。由本科生和研究生培养的样本实现的广泛合作预计将产生广泛的影响。在最先进的X射线和中子设施的研究将提供宝贵的教育机会，培养下一代材料物理学家。