Waseda University · Materials Science
Professor N. Takeda's research lab specializes in the synthesis and characterization of quantum materials, with a focus on heavy fermion systems, unconventional superconductivity, and Kondo phenomena in rare-earth and actinide-based intermetallic compounds. The lab investigates emergent quantum behaviors such as non-Fermi liquid behavior, intermediate valence, and strong electron correlations, often using low-temperature transport, specific heat, and magnetic susceptibility measurements. Recent work also extends into functional soft materials, particularly mechanofluorophores based on charge-transfer interactions for stimuli-responsive optical sensing. The lab aims to uncover fundamental principles governing strongly correlated electron systems and to develop advanced materials with tailored electronic and optical responses.
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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