早稲田大学 · 材料科学
Takeda教授の研究室は、強相関電子系や新規量子物質の物性を解明することを目的としており、特にルイジウム含有ペロブスカイト型ペロブスカイト系化合物や希土類元素を含む金属間化合物の超伝導・磁気的性質を精密に解明しています。Kondo効果や非フェルミ液体行動を示す重いフェルミ粒子系の発見や、機械的刺激で発光を制御する新規なスイッチング型フォトフォルム材料の開発も進めています。これらの研究は、物質の電子相関と物性の関係を深く理解する上で極めて重要です。
Figures are computed from collected data and may differ slightly.
We have studied superconducting and magnetic properties of RERu 4 Sb 12 prepared by an Sb-flux method and found that LaRu 4 Sb 12 is superconducting below 3.58 K and PrRu 4 Sb 12 is a Van Vleck paramagnet which becomes superconducting below 1.04 K. CeRu 4 Sb 12 is a unique substance which shows intermediate-valence behavior with a characteristic broad peak around 100 K in the magnetic susceptibility and Kondo-like behavior in the electrical resistivity at high temperatures. Furthermore, non-Ferm
Magnetic and transport properties of the ternary compound Ce 3 Pd 20 Si 6 are investigated down to 0.035 K. The temperature dependence of the electrical resistivity indicates that this compound is a new Kondo material. The low-temperature specific heat measurement reveals that C / T is strongly enhanced at low temperatures, reaching as high as 8 J/mole Ce · K 2 at 0.2 K. This leads to the conclusion that Ce 3 Pd 20 Si 6 is one of the heaviest-electron systems.
Supramolecular mechanofluorophores based on charge-transfer (CT) interactions between fluorescent pyrene and naphthalene diimide(s) with a tandem structure are newly developed and incorporated into the mid-chain of poly(ε-caprolactone)s. The fluorescence (FL) is quenched by the intramolecular CT interactions even at low concentrations both in solution and in the polymer matrix, and turn-on FL is induced upon application of mechanical forces.
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