Acquisition of a High-Magnetic-Field/Low-Temperature Facility for Materials Research with Synchrotron X-Rays

购置高磁场/低温设备，用于同步加速器 X 射线材料研究

• 批准号: 9802737
• 负责人: Martin Greven
• 金额: $ 26.86万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-15 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9802737&HistoricalAwards=false
• 关键词: Acquisition; Magnetic; Field; Low; Temperature

9802737GrevenSynchrotron X-ray scattering plays an increasingly important role in materials science and condensed matter physics. This award provides partial support for the acquisition of a nearly unique high-magnetic-field/low-temperature facility to be operated at one of the Nations's major synchrotron X-ray sources, the Stanford Synchrotron Radiation Laboratory (SSRL). This new facility will allow the study of structural and magnetic properties of novel materials with the high momentum-resolution unique to synchrotron-generated X-rays, at magnetic fields up to 13 Tesla, and over more than three orders of magnitude in temperature, 0.3K T 400K.The scientific program involves the study of materials in which electron-electron interactions play an important role. Such "correlated-electron" materials are at the frontier of condensed matter physics, and they provide myriad possibilities to discover, observe, and characterize nove fundamental phenomena. For example, the strong electron-electron correlations in charge-carrier-doped antiferromagnetic insulators with perovskite-derived structures are known to lead to such diverse properties as: (i) insulator-metal transitions, (ii) high-temperature superconductivity, (iii) colossal magnetoresistance, (iv) charge-ordered phases, (v) and spin-ordered phases. The structural, magnetic, and electronic properties are generally intimately coupled in these systems, and the presence of a magnetic field often leads to new phases. The scientific program involves charge, resonant magnetic, and non-resonant magnetic X-ray scattering techniques. It will furthermore involve in situ transport measurements to obtain simultaneous structural, magnetic, and electronic information. Moreover, it will benefit from complementary research involving the growth and characterization of single crystals, neutron scattering experiments, and the collaboration with the ongoing photoemission spectroscopy effort at Stanford. This new high-magnetic-field/low-temperature synchrotron X-ray facility will thus allow the invesitgator to conduct research at the forefront of materials science and condensed matter physics, and it will help educate a new generation of undergraduate and graduate students with materials science, applied science, and physics backgrounds.%%%***

9802737 GrevenSynchrotron X射线散射在材料科学和凝聚态物理学中发挥着越来越重要的作用。 该合同为购置一个几乎独一无二的高磁场/低温设施提供部分支助，该设施将在美国主要的同步加速器X射线源之一-斯坦福大学同步加速器辐射实验室（SSRL）-运行。 这一新设施将允许研究新材料的结构和磁性，其具有同步加速器产生的X射线所特有的高动量分辨率，磁场高达13特斯拉，温度超过三个数量级，0.3K T 400 K。 这种“相关电子”材料处于凝聚态物理学的前沿，它们为发现、观察和表征新的基本现象提供了无数的可能性。 例如，具有钙钛矿衍生结构的电荷载流子掺杂的反铁磁绝缘体中的强电子-电子相关性已知导致诸如以下的不同性质：（i）绝缘体-金属转变，（ii）高温超导性，（iii）庞磁阻，（iv）电荷有序相，（v）和自旋有序相。 在这些系统中，结构、磁性和电子性质通常紧密耦合，并且磁场的存在常常导致新的相。 科学计划涉及电荷，共振磁和非共振磁X射线散射技术。 它还将涉及现场传输测量，以获得同时的结构，磁性和电子信息。 此外，它将受益于补充研究，包括单晶的生长和表征，中子散射实验，以及与斯坦福大学正在进行的光电子能谱工作的合作。 这种新的高磁场/低温同步加速器X射线设备将使研究人员能够在材料科学和凝聚态物理的前沿进行研究，并将有助于教育新一代具有材料科学，应用科学和物理背景的本科生和研究生。