Kazuaki Iwasa

Evidence for Magnetic-Field-Induced Quadrupolar Ordering in the Heavy-Fermion Superconductor PrOs4Sb12

Neutron diffraction experiments on the heavy-fermion superconductor PrOs 4 Sb 12 revealed that a small antiferromagnetic moment, parallel to [010] ( y -direction), is induced in the field-induced phase ( H ∥ z ). The analysis, based on the Γ 1 singlet ground state crystal field model, shows that antiferro-order of O y z -type quadrupole moments of Pr ions is formed in the field-induced phase. This strongly suggests that the crystal field ground-state of Pr ions in PrOs 4 Sb 12 is the Γ 1 singlet and the quadrupolar ordering is induced due to level crossing with an excited state under a magnetic field.

Evolution of 4 f electron states in the metal-insulator transition of Pr Ru 4 P 12

Magnetic excitations of the filled skutterudite

Direct observation of quadrupolar excitons in the heavy-fermion superconductor PrOs4Sb12

\mathrm{Pr}{\mathrm{Ru}}_{4}{\mathrm{P}}_{12}

Crystal-structure modulation in the anomalous low-temperature phase of PrFe4P12

exhibiting a metal-insulator (M-I) transition at

Magnetic Excitations in Heavy-Fermion Superconductor PrOs4Sb12

{T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}=63\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Emergence of Magnetic Long-range Order in Frustrated Pyrochlore Nd2Ir2O7 with Metal–Insulator Transition

were studied by inelastic neutron scattering experiment. The spectra at temperatures much lower than

The Unconventional Superconductivity of Skutterudite PrOs4Sb12: Time-Reversal Symmetry Breaking and Adjacent Field-Induced Quadrupole Ordering

{T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}

Detection of Neutron Scattering from Phase IV of Ce0.7La0.3B6: A Confirmation of the Octupole Order

are described as well-defined crystal-field excitations. With approaching

Role of p-f hybridization in the metal-nonmetal transition of PrRu4P12

{T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}

Neutron-diffraction study of the unusual ordered phases of Ce0.75La0.25B6

, the excitation peaks broaden and shift considerably together with the temperature variation of the carrier number and the atomic displacement in the transition. The