中国科学院合肥物质科学研究院强磁场科学中心坐落于安徽省合肥市风景秀丽的科学岛，2008年4月30日经中国科学院批准成立，依托中国科学院合肥物质科学研究院管理（科发人教字〔2008〕133号），其前身是2005年12月20日成立的“合肥强磁场科学技术研究中心”。中心目标：发展... 更多简介 +
稳态强磁场实验装置（Steady High Magnetic Field Facility，简称SHMFF）是国家发改委支持的“十一五”国家重大科技基础设施。SHMFF法人单位是中国科学院合肥物质科学研究院，共建单位是中国科学技术大学。各项任务以中国科学院强磁场科学中心为依托... 更多简介 +
报告人：叶峰 研究员
时间\地点：2016年6月8日15:30 \ 强磁场中心203学术报告厅
报告题目：多铁氧化物单晶的中子衍射和X-射线衍射研究
报告摘要：I will discuss the neutron and x-ray diffraction results ofmultiferroics Mn1-xCoxWO4 and Ca3Mn1.9Ti0.1O7. MnWO4 is a classic example of frustratedmagnets with coupled electric and magnetic properties.. The magnetic ground state arises from the competing long range interactions and is subjected to various external (magnetic field, pressure) and internal (chemical substitution) perturbation. We use hydrostatic pressure as a tuning parameter, to clarify how the balance between controlling the magnetic anisotropy and modifying the long range magnetic interactions determines the ground state spin order. The appearance of ferroelectricity in the Ruddlesden-Popper compounds Ca3M2O7 (M=Mn,Ti) is believed to arise from a novel microscopic mechanism.The instability of the polar phonon mode is driven by the simultaneous condensation of two nonpolar lattice modes associated with oxygen octahedron rotation and tilt modes, and is responsible for the polar symmetry We have used single crystal neutron and x-ray diffraction to investigate the temperature and pressure dependence of these oxygen octahedron distortions in Ca3Mn1.9Ti0.1O7 which has a structural transition at 365 K and antiferromagnetic order at 120 K. We observed a strong interplay between magnetism and the local oxygen distortion near the magnetic transition. The control of the magnetism through octahedron distortion is discussed.
报告人简介：
Education
B.S. University of Science and Technology of China, 1996
M.S. University of Science and Technology of China, 1999
Ph. D. University of California, Santa Cruz, 2003
Professional Experience
1999-2003 Research Assistant, Department of Physics, UC Santa Cruz
2003-2008 Postdoctoral Research Associate, ORNL
2008-present Research staff and Lead instrument scientist for Corelli, ORNL
欢迎各位老师、同学踊跃参加
© 1996 - 强磁场科学中心 版权所有 皖ICP备05001008号-11
地址：安徽省合肥市蜀山湖路350号 邮编：230031 电话：0551-65591149 传真：0551-65591149 邮箱：chmfl@hmfl.ac.cn
表格下载