SPring-8 Users Community (SPRUC)

Research Group:

Atomic Resolution Holography



  Naohisa Happo
  3-4-1, Ozuka-Higashi,Asa-Minami-Ku,Hiroshima 731-3194 JAPAN
  Telephone / FAX: +81-(0)82-830-1553

Research Area:

Biomolecules, Fundamental Characterization, Measurements



Overview of Research Group, Goals and Purposes:

Atomic Resolution Holography Research Group is based on advanced structural analysis techniques of X-ray fluorescence (XFH) and photoelectron holography (PEH), which can visualize three dimensional atomic configurations around a specific element without any special structural models. In particular, these techniques provide clear information on the structural properties of dopants, e.g., the determinations of dopant sites. This information cannot be obtained by diffraction, which can be applied only to periodic lattices. Furthermore, these techniques are very sensitive to distortions of surrounding atoms, and thus, they can be applied also to the evaluation of lattice distortions in mixed crystal systems. XFH and PEH have suvccessfully clarified dopant sites and lattice distortions in various materials, such as semiconductors, superconductors, magnetic materials, structural materials and ferroelectric materials, which lead us to the atomic-level insight into the origin of the physical properties of materials.

The purpose of this research group is to arrange the platform so that researchers can freely access to this new structural information. In the first to the third periods, We established measurement techniques of XFH and PEH at SPring-8, and applied them to a wide variety of materials. The number of researchers using these techniques has increased drastically, and the arrangement of the platform is well designed. In this period, we will promote the development and establishment of more advanced techniques, such as time-resolved measurements, valence selective measurements, measurements with external fields and at low temperatures using a cryogenic system. In the research group meetings, we will discuss and summarize the requirements from each members, and reflect them for the development of experimental techniques.