Condensed Matter Experiment Ⅰ
Microscopic Research on Magnetism
|Associate Professor :||Shigeru Takagi|
Highly correlated electron systems in 5f-, 4f- and 3d-compounds as well as low-dimensional organic compounds show various interesting physical properties such as metal-insulator transition, valence fluctuation, heavy-electron behavior, multipolar ordering and lowdimensional quantum spin behavior.
We are exploring new target compounds and preparing high-quality samples by ourselves. In addition to various measurements on magnetic properties by basic methods, we are investigating these systems mainly through microscopic methods of Nuclear Magnetic Resonance (NMR) and Mössbauer spectroscopies. Generally in solids, nuclear magnetic moments are coupled to the electronic spin with modest strength, and this modestness makes these methods very powerful microscopic tools to probe the electronic states of the highly correlated electron systems. We are also performing neutron scattering experiments in order to study the magnetic structures and magnetic excitation behavior. High pressure is also very powerful in the study of these systems, because it can tune continuously and without disturbing the periodicity of the lattice the underlying delicate balance between itinerancy and localization in these systems. The combination of some of these methods can be quite powerful, and this has been constituting a frontier of our recent research.