ISSP - The institute for Solid State Physics

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Hiroi Group

Research Associate

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The remarkable discovery of high-Tc superconductivity and the following enthusiastic research in the last decade have clearly demonstrated how the finding of new materials would give a great impact on the progress of solid state physics. Now related topics are spreading over not only superconductivity but also unusual metallic behavior, which are often observed near the metal-insulator transition in the strongly correlated electron systems. We believe that for the next few decades it will become more important to explore novel physics through searching for new materials. A family of transition-metal oxides is one of the typical systems where Coulomb interactions play a critical role on the magnetic and electronic properties. Especially interesting is what is expected when electrons localized due to the strong Coulomb repulsion start moving by changing the bandwidth or the density of electrons. We anticipate there unknown, dramatic phenomena governed by many-body effects and quantum fluctuations.

Two 5d pyrochlore oxides. Cd2Os2O7 exhibits a metal-insulator transition to a magnetic octupole order below 230 K, while an itinerant multipole state is realized in Cd2Re2O7 with spontaneous spatial inversion symmetry breaking below 200 K.
Copper mineral volborthite representing a spin-1/2 kagome-lattice antiferromagnet.

Research Subjects

  1. Search for new materials realizing quantum spin systems or strongly correlated electron systems
  2. Ground state of the spin-1/2 kagome lattice antiferromagnet
  3. High-Tc superconductors