Hideki Yoshizawa Group
Group of Solid State Physics (The Institute for Solid State Physics) [Neutron Science]
exotic behaviors of the emergent materials such
as transition-metal oxices and rare-earth alloy superconductors
When I entered the graduate school and joined the neutron scattering laboratory, I learned that the research topics my supervisor has been stuying are very much exciting and producing a cutting-edge science in the filed of statistical physics of the low dimensional magnetism, and he has been leading the world. The materials in our world often show new unexpected features which cannot be predicted from the basic physics of elementary particles, and the interactions among many particles, for example, atoms, ions, electrons in the material cause the emergence of unexpected exotic behaviors. Some of those examples are anisotropic superconductivity, monopoles which cannot exist as an elementary particle in the particle physics but emerges in some oxices which have a particulr unique crystal structure.
Professor Hideki Yoshizawa
- 1981 Ph.D (The University of Tokyo)
- 1981 Associate Physicist, Brookhaven National Laboratory
- 1984 Associate Professor, ISSP, The University of Tokyo
- 2001 Professor, ISSP, The University of Tokyo
Introduction of the study
Yoshizawa group studies magnetic and superconducting behavior of exotic materials such as transition-metal oxides as well as rare-earth based metallic compounds by neutron scattering technique with use of pulse and steady-source neutron beams. The contol of hole concentration in transition-metal oxides drives insulator to metal and even shows superconducting behavior. The high pressue also leads normal metals or antiferromagnets to non BCS-type superconductivity. For exsample, a number of rare-earth based superconductors exhibit non BCS-type exotic supuerconductivity whose Cooper pairs have anisotropic symmetry in the momentum space. Some of the rare-earth compounds lack the crystal centrosymmetry and antisymmetric spin-orbit interaction generates virtual electric field which leads to extraordinary superconducting behavior, and mechanism of such exotic superconductivity is studied by observing spin fluctuations through neutron scattering experiments. The Neutron Science Laboratory of ISSP owns triple-axis spectrometers in the JRR-3 research reactor and chopper spectrometer in J-PARC, both research facilities are located in Tokai, Ibaraki.
Message from a senior
Prof. Yoshizawa educateds and trains graduate students in the Yoshizawa lab. through a man-to-man method with great patience. He has strong vitality and plenty of heart. Yoshizawa lab. utilises the neutron scattering as a research tool. This tool, neutron scattering, is now expanding its targets to industrial application, and supporting the strength of Japanes industries. Therefore, it is a great advantage to have an oppotunity to familiarize yourseives to such a tool during the graduate course, and there would be a chance to utilize it.