Topic: Exotic physical properties at competition between local and global orders: a neutron scattering study

Speaker: Bing Li (李昺)
           Japan Proton Accelerator Research Complex (J-PARC)

Time: 10:00, (Mon.) May 22, 2017

Venue: Room 356，Lee Hsun Building, IMR CAS

Astract: Neutron scattering has been proven to be a considerably powerful and even indispensable tool to characterize structures and dynamics of matter. In particular, recent significant development of high-energy spallation neutron sources provides a unique opportunity to reveal short-range atomic and magnetic orders that dominate a wide variety of exotic physical phenomena and functionalities. In this talk, a brief introduction to neutron scattering technology will be firstly given from the hands-on experiences, including determination of crystal and magnetic structures [1,2], short-range structures from pair distribution function analysis [3,4], phonon and magnon excitations [5,6]. Following is a detailed demonstration on how the interplay between ultrafast local atomic fluctuation and collective phonon excitations leads to liquid-like thermal conduction in intercalated layered solids [7] and unconventional transport properties in inorganic-organic hybrid perovskites [8]. At last, an ongoing quest to non-trivial large-scale spin orders will be described.

[1]. B. Li et al., Phys. Rev. B 93, 224405 (2016).
[2]. B. Li et al., Chem. Commun. 52, 2386 (2016).
[3]. B. Li et al., Adv. Electron. Mater. 2, 1500261 (2016).
[4]. B. Li et al., Phys. Rev. B 93, 014423 (2016).
[5]. B. Li et al., J. Phys. Soc. JPN 83, 084601 (2015).
[6]. B. Li et al., Phys. Rev. B 94, 224301 (2016).
[7]. B. Li et al., arXiv:1701.01192.
[8]. B. Li et al., arXiv:1612.01631, Nat. Commun., in press.

Bio:

Bing Li’s major research interests lie in neutron scattering study on atomic and magnetic disordered materials. He obtained his Ph. D from Institute of Metal Research, Chinese Academy of Sciences in 2012. Then, he moved to University of Virginia in USA as a postdoc research associate, where he had frequently visited SNS and NIST for neutron scattering experiments. In 2015, he joined J-PARC in Japan, affiliated with the Spectrometry Group and Disordered Materials Group in Neutron Science Section. He is currently a member of American Physics Society, Neutron Scattering Society of America, and The Japanese Society for Neutron Science.