RUI: Investigation of Strongly Correlated Electron Behavior in Rare-Earth Related Materials

RUI：稀土相关材料中强相关电子行为的研究

• 批准号: 1905636
• 负责人: Pei-Chun Ho
• 金额: $ 40.41万
• 依托单位: California State University-Fresno Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905636&HistoricalAwards=false
• 关键词: RUI; Investigation; Strongly; Correlated; Electron

Non-Technical AbstractThis project supports materials science research of rare-earth related materials at a minority-serving undergraduate institution. The primary focus is on the synthesis and characterization of superconducting and small-gap semiconducting rare earth filled skutterudite compounds, with the goal of understanding their underlying mechanisms. Many versatile technical applications result from the rare-earth materials of interest, for examples, superconducting materials can be used for energy conservation and energy storage; quantum magnets and topological insulators can be used in high performance electronics and quantum computers. The research in the principal investigator's laboratory allows direct participation of undergraduate and master-degree-program students in the experimental condensed matter physics, giving them hands-on experience at the early stage of their academic life. The practical experience of research and placement provided by this project not only can train students to develop good fundamentals, critical thinking, work ethics, and troubleshooting skills to become independent scientists, but also encourage students to pursue higher education and careers in the fields of STEM (Science, Technology, Engineering, and Math).Technical AbstractThis project supports experimental research in the strongly correlated electron phenomena in rare-earth related materials. These phenomena arise from a subtle interplay between competing interactions, either electronic or magnetic. They can be controlled through tuning the experimental parameters such as temperature, magnetic field, chemical substitution. The rare-earth compounds under investigation can be used as model systems to probe the localized and the itinerant nature of the electron states and test the existing theories for strongly correlated electron physics. These can be achieved through the synthesis of high-quality single crystals and the establishment of transport and thermodynamic properties. In the rare-earth filled skutterudite systems Pr1-xNdxOs4Sb12, the principal investigator (PI) is aiming to understand the unconventional nature of the superconductivity in PrOs4Sb12 by the effect of neodymium substitution. Furthermore, in the light of the PI's recent discovery of the exotic temperature-magnetic-field phase diagram of CeOs4Sb12, it indicates a valence transition and possible multiple phases. The PI plans to continue in examining the electronic behavior of SmOs4Sb12, CeOs4Sb12, the hole doping compounds of Ce1-xPrxOs4Sb12 and Ce1-xNdxOs4Sb12 in order to investigate the potential of topological insulating behavior in these systems. Eventually, the results of the proposed projects can help us understand the quantum critical behavior in PrOs4Sb12 whether its superconductivity resides near a quantum critical point associated with antiferromagnetic or ferromagnetic ordering, or something else such as quadrupole degree of freedom.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.

非技术摘要该项目支持少数派服务本科机构的稀有地相关材料的材料科学研究。 主要的重点是超导和小间隙半导体稀土填充的Skutterudite化合物的合成和表征，目的是了解它们的潜在机制。 许多多功能技术应用是由稀土材料引起的，例如，超导材料可用于节能和储能。量子磁铁和拓扑绝缘子可用于高性能电子和量子计算机。 首席研究者实验室的研究允许在实验性凝结物理学中直接参与本科生和主学位学生的研究，从而在他们的学术生活的早期阶段为他们提供了动手经验。 该项目提供的研究和位置的实践经验不仅可以培训学生发展良好的基础，批判性思维，职业道德和故障排除技巧，以成为独立科学家，而且还鼓励学生在STEM（科学，技术，技术，工程和数学）领域从事高等教育和职业。 这些现象来自电子或磁性竞争相互作用之间的微妙相互作用。 可以通过调整实验参数（例如温度，磁场，化学取代）来控制它们。 所研究的稀土化合物可以用作模型系统，以探测电子状态的局部和巡回性质，并测试现有理论是否有密切相关的电子物理学。 这些可以通过合成高质量的单晶以及运输和热力学特性来实现。 在稀土填充的Skutterudite系统PR1-XNDXOS4SB12中，首席研究员（PI）的目的是通过新近替代的效果来理解ProS4SB12超导性的非常规性。 此外，鉴于PI最近发现了CEOS4SB12的外来温度 - 磁性场相图，它表明价值过渡和可能的多个阶段。 PI计划继续检查SMOS4SB12，CEOS4SB12，CE1-XPRXOS4SB12和CE1-XNDXOS4SB12的孔掺杂化合物的电子行为，以研究这些系统中拓扑绝缘行为的潜力。最终，提议的项目的结果可以帮助我们了解PROS4SB12中其超导性的量子关键行为是否存在于与抗铁磁或铁磁秩序相关的量子临界点附近，或者诸如四倍体自由度之类的其他事物都反映了NSF的法定任务和综述的依据，该奖项是通过评估的范围来进行的。

项目成果

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs 4 Sb 12

CeOs 4 Sb 12 中有效 Ce 价、费米能和相界的压力诱导变化

• DOI: 10.1088/1367-2630/ac643c
• 发表时间: 2022
• 期刊: New Journal of Physics
• 影响因子: 3.3
• 作者: Götze, K.;Pearce, M. J.;Coak, M. J.;Goddard, P. A.;Grockowiak, A. D.;Coniglio, W. A.;Tozer, S. W.;Graf, D. E.;Maple, M. B.;Ho, P-C
• 通讯作者: Ho, P-C

Muon spin rotation and relaxation in Pr1−xNdxOs4Sb12 : Superconductivity and magnetism in Pr-rich alloys

Pr1−xNdxOs4Sb12 中的 μ 子自旋旋转和弛豫：富 Pr 合金中的超导性和磁性

• DOI: 10.1103/physrevb.106.144508
• 发表时间: 2022
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Ho, P.-C.;MacLaughlin, D. E.;Maple, M. B.;Shu, Lei;Hillier, A. D.;Bernal, O. O.;Yanagisawa, T.;Biswas, P. K.;Zhang, Jian;Tan, Cheng
• 通讯作者: Tan, Cheng

Muon spin relaxation and fluctuating magnetism in the pseudogap phase of YBa2Cu3Oy

YBa2Cu3Oy赝能隙相中的μ子自旋弛豫和涨落磁性

• DOI: 10.1103/physrevb.103.134426
• 发表时间: 2021
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Zhu Z. H.;Zhang J.;Ding Z. F.;Tan C.;Chen C. S.;Wu Q.;Yang Y. X.;Bernal O. O.;Ho P-C;Morris G. D.;Koda A.;Hillier A. D.;Cottrell S. P.;Baker P. J.;Biswas P. K.;Qian J.;Yao X.;MacLaughlin D. E.;Shu L.
• 通讯作者: Shu L.