MRI: Acquisition of a Cryogen-Free Physical Properties Measurement System (PPMS DynaCool)

MRI：获得无冷冻剂物理特性测量系统 (PPMS DynaCool)

• 批准号: 1828348
• 负责人: Sara Haravifard
• 金额: $ 48.86万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-10-01 至 2021-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1828348&HistoricalAwards=false
• 关键词: MRI; Acquisition; Cryogen; Free; Physical

Many of the pressing challenges that technologies are facing today in moving toward manufacturing the next generation of supercomputers or advanced communication tools can be solved with the targeted control of materials functionalities (e.g., electrical, magnetic or thermal properties). Measuring physical properties of materials under accurately controlled conditions plays a key role in understanding atomic scale properties of the new materials and accessing their utility for technical applications. The acquisition of the cryogen-free Physical Properties Measurement System (PPMS DynaCool) empowers researchers at Duke University to measure a wide range of materials properties with a high sample-throughput rate, without the need for any liquid cryogens. This state-of-the-art instrument not only enables the research training of students and postdoctoral associates, but it also benefits undergraduate and graduate engineering and science laboratory courses, and the extensive education outreach programs focused on materials research that are already in place at Duke for high school students, high school teachers, and undergraduates. This instrument is also available to the broader Research Triangle community, furthering the goal of developing a more diverse scientific workforce.----------The Physical Properties Measurement System (PPMS) is an important addition to Duke University?s materials research infrastructure and will greatly impact many areas of scientific inquiry, ranging from fundamental studies of quantum magnetism, topological effects and emergent critical phenomena, to electrical transport in nanomagnets and superconducting nanostructures, to designing and evaluating molecular, nanoscale and macroscopic materials, to studies of electronic correlations in carbon nanotubes and graphene, to characterization of novel organic semiconductor and hybrid materials for energy applications, to synthesis and characterization of high-temperature superconductors. The PPMS is equipped with an integrated conduction-cooled superconducting 14 Tesla magnet. This system provides seamless temperature transition and is capable of cooling the sample chamber from room temperature to 1.8 K and stabilizing to better than 0.001 K in under 45 minutes. A dilution refrigerator insert provides the capability to conduct measurements down to 50 mK, essential for probing quantum mechanical phenomena in materials. The sample chamber accommodates a wide range of measurement inserts, all of which allow fully automated data acquisition under computer control over the full range of magnetic field and temperature. A multi-function probe accommodates custom experiments, and a horizontal sample rotator allows magnetoresistance measurements as a function of sample orientation relative to magnetic field. This system provides the capability to measure electrical resistivity, thermal conductivity, specific heat, Hall Effect, and other thermoelectric properties, as well as susceptibility and magnetization. The cryogen-free feature of this system ensures cost-effective and reliable long-term operation of the equipment, enabling it to accommodate the large user base it will serve.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

当今技术在制造下一代超级计算机或高级通信工具方面所面临的许多紧迫挑战可以通过材料功能的目标控制（例如电气，磁性或热特性）来解决。在准确控制条件下测量材料的物理特性在理解新材料的原子量表特性并访问其技术应用程序方面起着关键作用。获得无低温物理特性测量系统（PPMS DynAcool）的获取使杜克大学的研究人员能够测量具有高样品直播速率的广泛材料特性，而无需任何液体冷冻剂。这种最先进的工具不仅能够对学生和博士后同事进行研究培训，而且还使本科和研究生工程和科学实验室课程受益，以及广泛的教育外展计划，这些课程旨在研究杜克大学的材料研究，这些材料研究已经在高中生，高中老师，高中老师和小学生中。该乐器也可以提供更广泛的研究三角社区，进一步发展了更多样化的科学劳动力。-----------------------------------------------------------------------------------------------------------------》（PPMS）是杜克大学材料研究基础设施的重要补充，并将极大地影响科学询问的许多领域，从许多领域影响量子学和量子学现象的基础研究，以及量子型磁性效应的重要效果，范围超导纳米结构，以设计和评估分子，纳米级和宏观材料，以研究碳纳米管和石墨烯中的电子相关性，以表征新的有机物半导体和能量应用的杂种材料，以构成高质体超导管的合成和表征。 PPM配备了集成的传导冷却超导超导14 TESLA磁铁。该系统提供了无缝的温度过渡，并能够将样品室从室温冷却至1.8 K，并在45分钟的时间内稳定至优于0.001 K。稀释冰箱插入物提供了对50 mk进行测量的能力，这对于探测材料中的量子机械现象至关重要。样品室可容纳各种测量插入物，所有这些插件都允许在计算机控制磁场和温度范围内的计算机控制下获取全自动数据。多功能探针可容纳自定义实验，水平样品旋转器允许磁化测量值作为样品方向相对于磁场的函数。该系统提供了测量电阻率，热导率，比热，霍尔效应和其他热电特性以及易感性和磁化的能力。该系统的无冰冻功能可确保设备的成本效益和可靠的长期操作，使其能够适应它将提供的大型用户群。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点评估来获得支持的，并具有更广泛的影响标准。