Materials World Network: Study of Lattice Dynamics and Phonon, Magnon and Electro-Magnon Interactions in Rare Earth Manganite Multiferroics

这项多学科的国际努力，由三个机构组成，莫斯科国家钢铁和合金研究所（MISIS），国家标准与技术研究所（NIST），盖瑟斯堡和罗文大学，旨在研究RMnO3 （R稀土）形式的多铁性锰酸盐，同时具有远程磁有序和铁电性的磁电化合物。人们对磁电学的基本物理学知之甚少。虽然提出的大多是现象学模型，但很少有人试图将磁和声子激发与观测到的性质联系起来。这项工作旨在通过对一组表征良好的高质量晶体进行各种光谱、结构和磁性测量，消除这些材料报道的有时明显矛盾的结果。有了这个材料世界网络奖，我们寻求利用RMnO3化合物的磁电性质和电磁能谱的结果，通过在稀土位点上取代来开发具有增强磁电耦合的材料。除了与多铁学技术应用的科学进步有关的明显好处外，美国本科生和俄罗斯研究生将被介绍到国际研究环境和新文化中，这将为他们在职业生涯中从事其他世界范围的活动做好准备。该项目由DMR凝聚态物理项目、DMR特别项目办公室以及俄罗斯和欧亚地区国际科学与工程办公室共同资助。

This multidisciplinary international effort, comprised of three institutions, Moscow State Steel and Alloys Institute (MISIS), National Institute of Standards and Technology (NIST), Gaithersburg, and Rowan University, aims to investigate multiferroic manganites of the form RMnO3 (R a rare earth), magnetoelectric compounds possessing simultaneous long-range magnetic order and ferroelectricity. Not much is understood about the underlying physics of magnetoelectrics. While there have been mostly phenomenological models put forth, there have been few attempts to correlate the magnetic and phonon excitations to the observed properties. This work seeks to eliminate the sometimes apparently contradictory results reported on these materials by performing various spectroscopic, structural and magnetic measurements on a set of well characterized high quality crystals.With this Materials World Network award, we seek to use the results on the magnetoelectric properties and electromagnon spectra of the RMnO3 compounds to develop materials with enhanced magnetoelectric coupling by substitution on the rare-earth site. In addition to the obvious benefits related to the scientific advancement for the technological application of multiferroics, American undergraduate and Russian graduate students will be introduced to an international research environment and to new cultures, which will prepare them for other worldwide activities during their careers.This project is cofunded by the DMR Condensed Matter Physics Program, the DMR Office of Special Programs, and by the Office of International Science and Engineering, Russia and Eurasia region.