Local Atomic Structure of Complex Oxides

显示出显著性能的复合电子氧化物，例如巨磁阻（CMR）锰氧化物和高温超导铜氧化物，具有与平均晶体结构不同的原子和纳米尺度的局部结构，并且这些局部结构比平均结构更直接地影响它们的电子性能。 本项目的目标是利用脉冲中子散射、同步辐射X射线散射和模拟来确定复杂电子氧化物的局部结构。 我们直接确定原子之间的距离使用的方法的原子对密度函数（PDF）分析的总散射数据，包括漫散射。 该项目获得的知识将为快速发展的高灵敏度氧化物技术提供科学基础，并将提出改进其性能的方法。 该项目还与洛斯阿拉莫斯中子科学中心的脉冲中子粉末衍射光束线（NPD）升级工作有关，该项目得到了NSF和DOE的支持。

0102565Egami Complex electronic oxides that show remarkable properties, such as the colossal magnetoresistive (CMR) manganites and the high-temperature superconductive cuprates, have atomic and nano-scale local structures that are distinct from the average crystal structure, and these local structures more directly influence their electronic properties than the average structure does. The goal of this project is to determine the local structure of complex electronic oxides using pulsed neutron scattering, synchrotron x-ray scattering and modeling. We directly determine the distances between atoms using the method of the atomic pair-density function (PDF) analysis of the total scattering data including diffuse scattering. %%%The knowledge obtained by this project would form a scientific basis for the rapidly developing technology of highly sensitive oxides, and would suggest ways of improving their performance. This project is also related to the effort to upgrade a pulsed neutron powder diffraction beamline, NPD, at the Los Alamos Neutron Science Center, supported by the NSF and DOE.