Spin- and Circular-Polarized Resonant Photoemission

9625340辛科维奇这项研究的目标是确定强关联电子系统中准粒子的性质和行为，在强关联电子系统中，能带形成起着重要作用。通过将自旋分析与过渡金属2P(L3)光吸收边附近的圆偏振软x射线辐射相结合，可以绕过分析非铁磁材料自旋偏振光电子能谱的常规困难。这些光电发射测量将首次将自旋分辨光电子能谱的应用扩展到所有过渡金属材料，而不考虑它们的磁性状态(铁磁、反铁磁等)。新技术将应用于简单过渡金属氧化物、高T_c超导体和窄带铁磁体。这些实验将使用欧洲和美国最先进的第三代同步辐射光源。对磁性材料的基本理解仍然不完整，特别是对于磁性电子相互作用强烈的那类材料。这些都是高度相关的电子系统，包括高温超导体。该项目利用最先进的同步辐射光源从磁性材料中产生光电发射电子。对光电子的磁性(自旋极化)的分析提供了关于磁性材料本身的关键信息。该项目的结果将检验目前关于高度关联电子系统中磁性起源的理论。这些信息主要是基本感兴趣的，其结果可能导致新的磁性和超导材料的发展。***

9625340 Sinkovich The objective of this research is to determine the nature and behavior of quasiparticles in strongly correlated electron systems, where band formation plays an important role. Conventional difficulties in analysis of spin polarized photoemission from non-ferromagnets will be circumvented by combining the spin analysis with circularly polarized soft-x-ray radiation in the vicinity of the transition metal 2P (L3) photoabsorption edge. These photo emission measurements will for the first time extend the application of spin-resolved photoemission spectroscopy to all transition metal materials irrespective of their magnetic state (ferromagnetic, antiferromagnetic, etc.). The new techniques will be applied to simple transition metal oxides, high-Tc superconductors, and narrow band ferromagnets. The experiments will use state-of-theart third generation synchrotron radiation sources in Europe and the United States. %%% The fundamental understanding of magnetic materials remains incomplete, particularly for the class of materials in which the magnetic electrons interact strongly with one another. These are highly correlated electron systems, and include the high temperature superconductors. This project exploits state-of-theart synchrotron radiation sources to produce photoemitted electrons from magnetic materials. An analysis of the magnetism (spin polarization) of the photoelectrons yields crucial information about the magnetic materials themselves. The results of the project will test current theories of the origin of magnetism in highly correlated electron systems. The information is primarily of fundamental interest and the results may lead to development of new magnetic and superconducting materials. ***