Kazunori Umeo

TL;DR: An antiferroquadrupolar ordering at T(Q) has been found in a Pr-based superconductor PrIr(2)Zn(20) and the measurements of specific heat and magnetization revealed the non-Kramers Γ(3) doublet ground state with the quadrupolar degrees of freedom.

TL;DR: In this paper, the first observation of superconductivity in the family of RT 2 X 20 (T = transition metal; X = Al and Zn) was made, and structural phase transitions manifest themselves at T s = 150, 138, and 200 K for LaRu 2 Zn 20, PrRu 2Zn 20, and LaIr 2Zh 20, respectively.

TL;DR: In this article, structural, transport, and thermal properties of carrier-tuned single-crystal x-ray diffraction data with the type-1 clathrate structure were reported.

TL;DR: In this paper, the authors analyzed the relationship between the coupling strength between the guest vibrational modes and the frameworks with different charge carriers and concluded that the evolution from crystalline to glasslike behavior is accompanied by an increase both in the effective density of tunneling states and in the resonant scattering level.

TL;DR: In this paper, thermal conductivity, specific heat, electrical resistivity, thermopower, and x-ray diffraction measurements performed on single-crystalline samples of the pseudoquaternary type-I clathrate system were analyzed.