CAREER: MilliKelvin Magnetic Field-Angle-Resolved Probe of Quantum Materials

职业：量子材料的毫开尔文磁场角分辨探针

• 批准号: 0952716
• 负责人: Johnpierre Paglione
• 金额: $ 55万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2015-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0952716&HistoricalAwards=false
• 关键词: CAREER; MilliKelvin; Magnetic; Field; Angle

****NON-TECHNICAL ABSTRACT****The anisotropy of physical properties is a key distinguishing feature of crystalline systems, is central to the nature of fundamental interactions and their resultant phases, and is known to play a key role in stabilizing many exotic phases of matter such as high-temperature superconductivity. Motivated by the recent discovery of a new family of iron-based superconductors with intriguing fundamental properties and much promise for technological applications, this Faculty Early Career Award supports a program with a goal of developing an experimental platform capable of probing the symmetry and anisotropic nature of quantum materials by measuring heat capacity and other thermal properties in large fully rotatable magnetic fields and at temperatures approaching absolute zero. By providing a new experimental tool previously unavailable to the U.S. condensed matter physics community, several fundamental questions regarding the nature of high-temperature superconductivity and other exotic states of matter can now be addressed. This provides an opportunity for investigation of a wide range of materials of interest to both fundamental and applied research in physics, chemistry, materials science and other disciplines, and with promise for applications in energy and health-related fields. An important component of this CAREER research program is the integration of an extended education program that will include the participation of both undergraduate students through co-operative work-study programs and local-area high school students through Science Magnet Programs. Also, an international junior researcher short-visit exchange program will be organized to enhance the experience of undergraduate students, graduate students and postdoctoral scholars working on collaborative projects.****TECHNICAL ABSTRACT****This Faculty Early Career Award supports a project seeking to elucidate the fundamental nature of unconventional superconductivity and the ground state properties of quantum critical systems via experimentally accessible methods of quantum tuning. The key approach is to develop an experimental platform capable of probing the symmetry and anisotropic nature of quantum materials by performing thermal transport and thermodynamic measurements down to milliKelvin temperatures in a rotatable vector magnetic field environment. With precise angular control of large, directional magnetic fields at low temperatures, specific heat and thermal conductivity probes will be used to a) map the symmetry of superconducting order parameters in iron-based and heavy-fermion superconductors, and b) investigate the role of anisotropy in quantum critical systems by measuring straightforward, interpretation-independent quantities to test the basic nature of particle excitations. An important component of this research program is the integration of an extended education program that will include the participation of both undergraduate students through co-operative work-study programs and local-area high school students through Science Magnet Programs. Also, an international junior researcher short-visit exchange program will be organized to enhance the experience of undergraduate students, graduate students and postdoctoral scholars working on collaborative projects.

*非技术摘要*物理性质的各向异性是晶体系统的一个关键区别特征，对基本相互作用及其结果相的性质至关重要，并已知在稳定物质的许多奇异相方面发挥着关键作用，如高温超导。由于最近发现了一种新的铁基超导体家族，具有耐人寻味的基本性质和巨大的技术应用前景，该学院早期职业奖支持一项计划，其目标是开发一个实验平台，能够通过在完全可旋转的大磁场和接近绝对零度的温度下测量热容和其他热性质来探索量子材料的对称性和各向异性。通过提供一种美国凝聚态物理界以前无法获得的新实验工具，现在可以解决关于高温超导和其他奇异物质状态的性质的几个基本问题。这为对物理、化学、材料科学和其他学科的基础和应用研究感兴趣的广泛材料的研究提供了机会，并有望在能源和健康相关领域得到应用。这一职业研究计划的一个重要组成部分是整合延伸教育计划，该计划将包括本科生通过合作勤工俭学计划参与，以及当地高中生通过科学磁石计划参与。此外，还将组织一个国际初级研究人员短期访问交流计划，以加强本科生、研究生和博士后学者在合作项目中的经验。*技术摘要*该学院早期职业奖支持一个项目，该项目旨在通过可通过实验获得的量子调谐方法来阐明非传统超导的基本性质和量子临界系统的基态属性。关键的方法是开发一个实验平台，通过在可旋转的矢量磁场环境中执行低至毫克开尔文温度的热输运和热力学测量，来探索量子材料的对称性和各向异性。随着在低温下对大的定向磁场的精确角度控制，比热和热导率探测器将被用于a)绘制铁基和重费米子超导体中超导序参数的对称性图，以及b)通过测量直接的、与解释无关的量来测试粒子激发的基本性质，来研究各向异性在量子临界系统中的作用。这一研究计划的一个重要组成部分是整合延伸教育计划，其中将包括本科生通过合作勤工俭学计划参与，以及当地高中生通过科学磁石计划参与。此外，还将组织国际初级研究人员短期访问交流计划，以加强本科生、研究生和博士后学者在合作项目中的经验。