Probing Effects of Pressure, Mixed Valence, and Spin Frustration on Itinerant Magnets

探测压力、混合价态和自旋受阻对流动磁体的影响

基本信息

批准号：
1905499
负责人：
Mykhailo Shatruk
金额：
$ 48.83万
依托单位：
Florida State University
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：
2019-08-15 至 2023-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905499&HistoricalAwards=false
关键词：
Probing Effects Pressure Mixed Valence

项目摘要

PART I: NON-TECHNICAL SUMMARYThis project focuses on investigation of itinerant magnets, a unique class of materials used in societally important clean-energy technologies, including electric vehicles, wind turbines, and magnetic refrigerators. Early studies offered understanding of magnetism in simple metals -- iron, cobalt, and nickel. Currently, however, the state of knowledge and theoretical tools available to materials scientists affords insight into magnetic behavior of more complex intermetallic systems, consisting of two or more elements. This project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, will combine advanced theoretical methods with experimental studies of itinerant magnets. Chemical synthesis, applied pressure, and high magnetic fields will be used to trigger changes in magnetic behavior. A detailed analysis of the changes observed will establish how itinerant magnets respond to variations in their crystal and electronic structures. The outcome of these studies will be improved understanding of itinerant magnets for the design of advanced magnetic materials to be used in clean-energy technologies and other applications. The diversity of theoretical and experimental tools employed in this project will provide unique research training for graduate and undergraduate students, who will become proficient in solid state chemistry, materials synthesis and characterization, and quantum-chemical calculations. For broader outreach, the project PI will also organize nationwide undergraduate summer schools in magnetism and magnetic materials.PART II: TECHNICAL SUMMARYItinerant magnetism has been a fascinating area of research in condensed-matter physics for many decades. Currently, however, such magnetic systems are receiving renewed attention from solid-state chemists, due to the broader availability of theoretical tools for investigation of electronic structure and improved insight into peculiarities of chemical bonding in the solid state. This project aims to uncover correlations between the nature of magnetic ordering and chemical bonding in itinerant magnets by exploring the interplay between the crystal and electronic structure and magnetic properties as a function of chemical substitution, applied pressure, or magnetic field. One aspect of the project will focus on complex transition metal pnictides, with an emphasis on effects of pressure and light-induced excitations that may lead to drastic changes in metallic behavior. The project will also investigate behavior of spin-frustrated systems with metallic or strongly covalent bonding. These studies target the next level of complexity in the spin-frustrated systems, where the addition of itinerant magnetic behavior can lead to the discovery of exotic spin textures and unconventional spin dynamics. The proposed research activities will provide versatile training to graduate and undergraduate students in materials synthesis, investigation of structural and magnetic properties, and studies of the electronic band structure. Undergraduate students and students from underrepresented groups will be involved in the project, both as researchers and through participation in national undergraduate summer schools in magnetism and magnetic materials organized by the PI. This project is supported by the Solid State and Materials Chemistry program in the Division of Materials Research.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.

第一部分：非技术总结项目的重点是研究巡回磁铁，这是一种独特的材料，用于社会重要的清洁能源技术，包括电动汽车，风力涡轮机和磁性冰箱。早期研究提供了对简单金属的磁性的理解 - 铁，钴和镍。但是，目前，材料科学家可用的知识和理论工具的状态可深入了解更复杂的金属间系统的磁性行为，包括两个或多个元素。该项目由材料研究部中的固态和材料化学计划支持，将结合先进的理论方法与巡回磁铁的实验研究。化学合成，施加的压力和高磁场将用于触发磁性行为的变化。对观察到的变化的详细分析将确定巡回磁铁如何应对其晶体和电子结构的变化。这些研究的结果将得到改善对迭代磁铁的理解，用于设计用于清洁能源技术和其他应用中的先进磁性材料。该项目采用的理论和实验工具的多样性将为研究生和本科生提供独特的研究培训，他们将精通固态化学，材料合成和表征以及量子化学计算。对于更广泛的宣传，PI项目还将在全国范围内组织磁性和磁性材料的本科暑期学校。第II部分：技术摘要磁性磁性一直是凝聚生理学物理学的有趣领域。然而，由于更广泛的理论工具可用于研究电子结构并改善对固态化学键合的特殊性的理论工具的广泛可用性，因此目前，此类磁系统正在从固态化学家那里受到重新关注。该项目的目的是通过探索晶体和电子结构之间的相互作用，以及与化学替代，施加的压力或磁场之间的相互作用，从而发现磁性排序的性质与巡回磁体中化学键合之间的相关性。该项目的一个方面将集中于复杂的过渡金属pnictides，重点是压力和光引起的兴奋的影响，这可能导致金属行为的急剧变化。该项目还将研究具有金属或强烈共价键合的自旋效率系统的行为。这些研究针对自旋效率系统中的下一个复杂性，在这种系统中，添加巡回磁性行为可以导致发现外来的自旋纹理和非常规的自旋动力学。拟议的研究活动将为材料合成，结构和磁性的研究以及电子带结构的研究提供多功能培训。作为研究人员，以及通过参加PI组织的磁性材料和磁性材料的全国本科暑期学校，本科生和来自代表性不足的团体的学生和学生将参与该项目。该项目得到了材料研究部的固态和材料化学计划的支持。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响评估标准，被认为值得通过评估来支持。

项目成果

期刊论文数量（19）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Reentrant spin glass state induced by structural phase transition in La0.4Ce0.6Co2P2

DOI：
10.1103/physrevmaterials.4.074412
发表时间：
2020-07-22
期刊：
PHYSICAL REVIEW MATERIALS
影响因子：
3.4
作者：
Clark, Judith K.;Tan, Xiaoyan;Shatruk, Michael
通讯作者：
Shatruk, Michael

Structural changes upon magnetic ordering in magnetocaloric AlFe 2 B 2

磁热 AlFe 2 B 2 中磁有序的结构变化

DOI：
10.1063/5.0007266
发表时间：
2020
期刊：
Applied Physics Letters
影响因子：
4
作者：
Oey, Yuzki M.;Bocarsly, Joshua D.;Mann, Dallas;Levin, Emily E.;Shatruk, Michael;Seshadri, Ram
通讯作者：
Seshadri, Ram

Magnetostriction of AlFe2B2 in high magnetic fields

AlFe2B2 在强磁场中的磁致伸缩

DOI：
10.1103/physrevmaterials.5.064409
发表时间：
2021
期刊：
Physical Review Materials
影响因子：
3.4
作者：
Sharma, S.;Kovalev, A. E.;Rebar, D. J.;Mann, D.;Yannello, V.;Shatruk, M.;Suslov, A. V.;Smith, J. H.;Siegrist, T.
通讯作者：
Siegrist, T.

Effect of electron- and hole-doping on properties of kagomé-lattice ferromagnet Fe 3 Sn 2

电子和空穴掺杂对 Kagomé 晶格铁磁体 Fe 3 Sn 2 性能的影响