学术报告 （2018年1月20日）

主持人：王 猛 教授

欢迎广大师生前来参加！

2018年中子科学系列学术报告（1）

报告人简介：报告人于1997年在西澳大利亚大学取得博士学位，之后在西澳大利亚大学、德国明斯特大学、日本东京大学、美国洛斯阿拉莫斯国家实验室、美国橡树岭国家实验室从事科学研究工作，研究工作包括利用中子散射研究磁性纳米材料、磁性薄膜材料、磁性材料的非弹性中子散射研究、自旋轨道耦合等。2003年就职于澳大利亚布拉格研究所中子散射中心，任谱仪科学家，负责成功建设并运行冷中子时间飞行谱仪PELICAN。谱仪运行以来得到了大量高质量的科研成果。

报告摘要： The time-of-flight direct-geometry neutron spectrometer [1], Pelican, has been in user program since 2014 at the OPAL research reactor, at the Australian Nuclear Science and Technology Organisation (ANSTO). The Pelican instrument was designed to meet the diverse requirements of the Australian scientific community from physics, chemistry, material science, to biology. A wide range of research fields is covered. These include crystal-field excitations, phonon densities of states, magnetic excitations for various multifunctional materials including high Tc superconductors, novel magnetic, thermoelectric, ferroelectric and piezoelectric materials; molecular dynamics in hydrogen-bonded and storage materials, catalytic materials, cements, soils and rocks; and water dynamics in proteins and ion diffusion in membranes. Polarized neutrons and polarisation analysis option makes the full use of the neutron spin to study magnetism and to separate the coherent and incoherent scatterings. 

In this presentation, the performance and capabilities of the instrument will be demonstrated with several systems studied using quasi-elastic and inelastic neutron scatterings. These include water dynamics around amino acids, crystal field excitations in magnetic molecular crystals, low energy magnetic excitations in spin frustrated magnet, oxygen diffusion in solid oxide conductors and phonon density of states in thermoelectric materials. 

[1] D. H. Yu, R. A. Mole, T. Noakes, S. Kennedy and R. Robinson, J. Phys. Soc. Jpn. 82, SA027 (2013).