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Neutron Scattering Study on the Advanced Thermoelectric and Magnetic Materials
时间:2017-05-16 11:02    点击:   所属单位:先进材料与纳米科技学院
讲座名称 Neutron Scattering Study on the Advanced Thermoelectric and Magnetic Materials
讲座时间 2017-05-18 10:00:00
讲座地点 南校区G楼118报告厅
讲座人 马杰
讲座人介绍 马杰,上海交通大学物理与天文学院特别研究员,博士生导师,美国衣阿华州立大学物理与天文系博士,美国橡树岭国家实验室和田纳西大学物理与天文系博士后。长期从事凝聚态物理前沿实验研究方面的工作,尤其是运用中子散射及同步辐射X光技术对强关联体系功能材料的晶体结构、声子谱和磁子谱进行研究,探讨材料中电子、磁子、声子和轨道等相互作用及其导致的诸如电荷有序、轨道晶格耦合、自旋晶格相互作用等新奇量子效应和物理现象,以及这些效应对功能材料中各种性能的影响。已在Science, Nature Materials, Nature Nanotechnology, Physical Review Letters, Journal of the American Chemical Society 等国际主流杂志上发表论文40篇,他引1400余次;2015年入选第十一批“千人计划”青年人才;近年,在国际学术会议及国内外高校做邀请报告30余次。
讲座内容 As a very useful tool, the neutron scattering technique can provide not only the lattice and magnetic structure, but also the dynamics across the entire Brillouin zone. As typical advanced functional materials, both the thermoelectric and magnetic compounds have attracted a lot attention in the past years. Establishing a complete picture of phonon and spin-wave dispersions is important to the understanding of the microscopic characterization and the design of an efficient advanced functional compound. In our study, these measurements have provided key insights about phonon and spin-wave scattering mechanisms, such as phonon anharmonicity, scattering by point defects or nanostructures and spin-wave. Furthermore, the first-principles simulations of atomic dynamics were performed. We presented the results of several important thermoelectric materials, PbTe, and AgSbTe2, and illustrated how this integrated approach could be used to reach a new level of understanding of the thermal conductivity. Moreover, the magnetic materials would be discussed.
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