Excellence in Research: Understanding Structural, Magnetic, and Electronic Properties of Chromium Telluride

卓越的研究：了解碲化铬的结构、磁性和电子特性

• 批准号: 2302436
• 负责人: Samaresh Guchhait
• 金额: $ 43.11万
• 依托单位: Howard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2302436&HistoricalAwards=false
• 关键词: Excellence; Research; Understanding; Structural; Magnetic

Non-technical AbstractIn recent years, there has been an increased interest in green technologies, which can lower the dependence on non-renewable sources of energy, thus reducing their environmental impacts. Magneto-caloric materials are an important class of materials being explored in this endeavor. These materials have potential applications in solid-state refrigeration, micro-coolers, energy conversion, magnetic pump, induced magnetic hyperthermia, and controlled drug delivery. In this project, we study a room temperature magneto-caloric material, chromium telluride, to understand the relationship between its magnetic, electronic and structural properties. The research is performed at Howard University in collaboration with national laboratories, which enables Howard University researchers to forge close research collaborations with outside communities. Howard University is the largest research-active historically black university (HBCU), with a large historically underrepresented student population. Therefore, this research is bringing cutting-edge research opportunities to underrepresented minority students and is broadening their participation in materials science research. These researchers are being trained in advanced material science research, data analysis, simulations, scientific writing, and presentation skills. This will enhance their competitiveness with prospective employers both in academia and industry. Technical AbstractRecently, chromium chalcogenides have drawn much interest due to their diverse magnetic properties. This project studies one room-temperature magnetic material, chromium telluride, to understand the relation between its structural, magnetic, and electronic properties. The research includes single crystal growth, magnetic, heat capacity, magneto-transport, synchrotron x-ray scattering, and neutron diffraction studies, all supplemented by density functional theory (DFT)-based simulations. Pair distribution function studies are performed to determine the evolution of the chromium telluride structure with temperature. Coherent soft x-ray spectroscopy studies help determine its ground-state electronic structure. Furthermore, neutron diffraction studies help determine its magnetic ordering. This project helps answer unaddressed fundamental questions associated with its magneto-structural phase transitions. In addition, this material is used to explore the parallel anomalous Hall effect (PAHE). Therefore, this proposed research aligns well with the Howard Forward strategy of providing underrepresented minority students with exceptional educational and research experiences and attracting next-generation STEM scholars from such groups.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.

近年来，非技术抽象素对绿色技术产生了越来越多的兴趣，这可以降低对不可再生能源的依赖，从而减少其环境影响。磁含量材料是在这项工作中探索的重要材料类别。这些材料在固态制冷，微冷器，能量转换，磁泵，诱导磁性高温和受控药物输送中具有潜在的应用。在这个项目中，我们研究了室温磁含量材料，牙脲铬，以了解其磁性，电子和结构特性之间的关系。该研究是在霍华德大学与国家实验室合作进行的，这使霍华德大学的研究人员能够与外部社区进行密切的研究合作。霍华德大学是历史上最大的研究活性黑人大学（HBCU），历史上代表性不足。因此，这项研究为代表性不足的少数民族学生带来了尖端的研究机会，并正在扩大他们参与材料科学研究。这些研究人员正在接受高级材料科学研究，数据分析，模拟，科学写作和演示技巧的培训。这将提高他们与学术界和行业的潜在雇主的竞争力。技术突出地，由于其多样化的磁性特性，辣椒剂铬源引起了极大的兴趣。该项目研究一种室温磁性材料，牙嘌呤铬，以了解其结构，磁性和电子特性之间的关系。这项研究包括单晶生长，磁性，热容量，磁通型传输，同步加速器X射线散射和中子衍射研究，所有这些都由基于密度功能理论（DFT）基于模拟的密度功能理论补充。进行配对分布函数研究以确定用温度的铬化物结构的演变。相干的软X射线光谱研究有助于确定其地面电子结构。此外，中子衍射研究有助于确定其磁顺序。该项目有助于回答与磁结构相变相关的未解决的基本问题。另外，该材料用于探索平行的异常霍尔效应（PAHE）。因此，这项拟议的研究与霍华德的前进策略非常吻合，霍华德的前进策略是为代表性不足的少数群体提供了非凡的教育和研究经验，并吸引了此类群体的下一代STEM学者。该奖项反映了NSF的法定任务，并认为通过使用该基金会的知识分子和更广泛的影响来评估CRITERIA CRITEIA CRITERIA。