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Current Research

The problem of strong electron-electron correlation has lately attracted our attention since the discovery of high-temperature superconductivity and heavy electron system.

Our research is involved with the synthesis, chemical characterization and measurement of physical properties on condensed states of matter where the strong electron-electron correlation determines the physical nature of the material.

Research Apparatus

Presently under study are compounds of transition metal and/or rare-earth which display unusual phenomena as follows.

3d Transition Metal Compounds and their Magnetism, Itinerant Magnetism and Superconductivity

Low Dimensional Magnetic Insulators

  • Quasi 1-D Alternating Chain System: Pb2V3O9

Itinerant Magnetism and Superconductivity

  • Triangular Lattice Oxide: AxCoO2,AxCoO2・yH2O
  • Itinerant Antiferromagnetic Boride: Cr1-xVxB2
  • Week Itinerant Ferromagnetism and Magnetic Instabilities: Ni3Al and Al-site Substitution
  • Itinerant Ferromagnetic with layered structure: LaCoAsO and its Family
  • Iron-Based Layered Superconductor: FeSe1-x, FeTe1-x and its Solid Solution Fe1+dTe1-xSex
  • Ferromagnetic Fluctuation and Superconductivity: Ca3Ir4Sn13 and its Family

Fluorides

  • Pyrochlore: CdM2F6S, HgM2F6S, HgM2F6O
  • Modified Pyrochlore: AV2F6, ACr2F6
  • Double Perovskite: A2BTiF6

4d and 5d Transition Metal Compounds

Itinerant Magnetism and Metal-insulator transition

  • QCP of 3D Itinerant Ferromagnetism: Sr1-xCaxRuO3
  • Metal-Insulator Transition and the Formation of a Spin-Gap in Pyrocholore-type Oxide: Tl2Ru2O7
  • Superconductivity and Structural Phase Transitions in Metal Pyrochlore Oxide: Cd2Re2O7, Pb2Re2O7

4f Metal Compounds

Itinerant Ferromagnetism and Valence Fluctuation

  • Itinerant Magnetism of Two-Dimensional Square-Lattice Magnet Compounds: LaTe3, CeTe3
  • 4f Kagome-like lattice x 4d Itinerant Magnetic Triangular Lattice: R3Ru4Al12
  • Valence Fluctuation: Yb1-xYxInCu4