Condensed Matter Experiment Ⅰ

Strongly Correlated Electron Physics


Guest Professor : Shin-ichi Fujimori Yuka Ikemoto
Visiting Professor : Satoshi Kera


Strongly Correlated Electron Physics Group consists of three guest professors belonging to national and independent research institutes. Research topics of each group are as follows.

Shin-ichi Fujimori (JAEA)

Among the strongly-correlated electron systems, rare-earth and actinide compounds attract attention due to their various physical properties such as unconventional superconductivity and complex magnetism. In our laboratory, we study strongly-correlated rare earth and actinide compounds by using the photoelectron spectrometer (right photo) and XMCD spectrometer at the soft x-ray beamline SPring-8 BL23SU (left photo). Our aim is to understand the origin of their physical properties by revealing their electronic and magnetic properties.

Pphotoelectron spectrometer (right photo) and XMCD spectrometer at the soft x-ray beamline SPring-8 BL23SU (left photo)

Yuka Ikemoto (SPring-8)

At the infrared materials science beamline BL43IR at SPring-8, infrared (IR) synchrotron radiation has been mainly used for infrared micro-optical spectroscopy, and it has contributed to the studies of strongly correlated electron systems. The synchrotron radiation (SR) covers wide energy range from x-ray to IR. It plays an important role not only in physics but also in various fields from basic science to industrial applications. IR beam at SPring-8 has features of high brilliant, which make it possible to perform IR spectroscopy under different conditions than the conventional IR source. Figure 1 shows a photograph of BL43IR. IR microspectroscopy under various sample conditions is carried out at BL43IR. Among them, magnetic field and humidity control systems are intensively developed recently. IR near-field spectroscopy system development is also carried out.

SPring-8 BL43IR

Satoshi Kera(Institute for Molecular Science)

Some of organic compounds show a peculiar property as a strongly-correlated electron. The nature would be considered in a unique hierarchy character of a localized electron in a molecule. Most of the molecules form a solid by a weak vdW force, hence the origins of materials function and properties are governed by a weak electronic coupling as well as a strong electron-phonon coupling. Since the impacts of such a weak interaction on the electronic state are appeared competitive and complicated way, it is very difficult to evaluate experimentally. We have investigating the characteristics of molecular assemble by looking the electronic states and vibrational states precisely.

UVSOR-III Synchrotron: The state-of-the-art instruments “Photoelectron Momentum Microscope” was installed at BL6U.
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