Research Activities

　　　 
        Interacting many-particle systems exibit many interesting phenomena such as
       magnatism and superconductivity.Our group focuses on the theoretical study 
       of those interacting many-particle systems.
　
       (1) Electron correlations are essentail in certain transition-metal,lanthanide,
       and actinide alloys. Effective masses of quasi-particles are 10-1000 times as
       large as electron mass. Such alloys are called heavy-electron systems. One of
       our projects is to clarify theoretically exotic magnetism and superconductivity
       in heavy-electron systems. It includes a theoretical study on the mechanism 
       of high-temperature superconductivity in cuprate oxides.
　
       (2) 3He particles, which obey Fermi statistics, undergoes a phase transition
       around 3mK into a couple of superfluid phases. The Cooper pairs of those
       phases have the internal degrees of freedom to display phenomena different
       from the conventional BCS superconductors. Some of the above-mentioned heavy
       electrons are also reported to form anisotropic Cooper pairs. Another project
       is to study those phenomina characteristic of the anisotropic Cooper pairs. 
 

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