Self-organized electronic superlattices in transition metal oxides studied by means of novel synchrotron radiation techniques

掺杂过渡金属氧化物中电子合作的研究是当代凝聚态研究的一个中心问题。这些材料显示出各种各样迷人的物理现象，如高温超导性和巨磁阻，这些现象是由晶格与不同的电子自由度（如自旋，电荷和轨道）之间的复杂相互作用引起的。电子之间的相互作用通常导致这些电子自由度的长程有序，从而导致电子超晶格具有比底层晶格结构更大的周期性。因此，电子超晶格是电子之间复杂相互作用的直接表现，因此，对这些有序现象的研究是阐明电子合作机制的有力途径。在加拿大温哥华的AMPEL研究中心的这个项目中，我们计划通过一种新的同步辐射技术，即共振软X射线散射，研究掺杂的铜酸盐、锰氧化物和钴酸盐中的电子超晶格。这项技术为研究电子超晶格提供了一个独特的实验探针，并将用于澄清具有高度科学相关性的问题。此外，该研究员将参与开发一个全新的共振弹性和非弹性X射线散射设施，该设施在欧洲尚不存在。计划中的项目为获得新的科学技能和扩大研究员的国际经验提供了一个独特的机会。

The study of electronic cooperation in doped transition metal oxides is a central issue of contemporary condensed matter research. These materials display a large variety of fascinating physical phenomena like high-temperature superconductivity and colossal magneto-resistance that arise from complex interactions between the lattice and different electronic degrees of freedom like spins, charges, and orbitals. The interactions among the electrons often lead to a long range ordering of these electronic degrees of freedom, resulting in electronic superlattices that have a larger periodicity than the underlying lattice structure. Consequently, an electronic superlattice is a direct manifestation of the intricate interactions between the electrons and, therefore, the study of these order phenomena is a powerful approach to elucidate the mechanisms of electronic cooperation. Within this project at the AMPEL research center in Vancouver, Canada, we plan to study electronic superlattices in doped cuprates, manganites and cobaltates by means of a novel synchrotron radiation technique, namely Resonant Soft X-ray Scattering. This technique provides a unique experimental probe to investigate electronic superlattices and will be used to clarify issues of high scientific relevance. In addition, the fellow will participate in the development of a completely new Resonant Elastic and Inelastic X-ray Scattering facility, which does not yet exist in Europe. The planned project provides a unique opportunity to achieve new scientific skills and to widen the international experience of the fellow.