Ikuto Kawasaki

Neutron Scattering Study on Competition between Hidden Order and Antiferromagnetism in U(Ru1-xRhx)2Si2 (x ≤0.05)

We have performed elastic and inelastic neutron scattering experiments on solid solutions of U(Ru 1- x Rh x ) 2 Si 2 with Ru-rich concentrations: x =0, 0.01, 0.02, 0.025, 0.03, 0.04 and 0.05. Hidden order is suppressed with increasing x , and correspondingly, the onset temperature T m (∼17.5 K at x =0) of weak antiferromagnetic (AF) Bragg reflection decreases. For x =0.04 and 0.05, no magnetic order is detected in the investigated temperature range down to 1.4 K. In the intermediate range, 0.02 ≤ x ≤0.03, we found that the AF Bragg reflection is strongly enhanced. At x =0.02, this enhancement takes place at ∼7.7 K (≡ T M ), which is significantly lower than T m (∼ 13.7 K). T M increases with increasing x , and seems to merge with T m at x =0.03. If the AF state is assumed to be homogeneous, the staggered moment µ o estimated at 1.4 K increases from 0.02(2) µ B /U ( x =0) to 0.24(1) µ B /U ( x =0.02). The behavior is similar to that observed under hydrostatic pressure (µ o increases to ∼0.25 µ B /U at 1.0 ...

Electronic Structure of Heavy Fermion Uranium Compounds Studied by Core-Level Photoelectron Spectroscopy

High-energy-resolution core-level and valence-band photoelectron spectroscopic studies were performed for the heavy fermion uranium compounds UGe 2 , UCoGe, URhGe, URu 2 Si 2 , UNi 2 Al 3 , UPd 2 Al 3 , and UPt 3 as well as typical localized and itinerant uranium compounds to understand the relationship between the uranium valence state and their core-level spectral line shapes. In addition to the main line and high-binding energy satellite structure recognized in the core-level spectra of uranium compounds, a shoulder structure on the lower binding energy side of the main lines of localized and nearly localized uranium compounds was also found. The spectral line shapes show a systematic variation depending on the U 5 f electronic structure. The core-level spectra of UGe 2 , UCoGe, URhGe, URu 2 Si 2 , and UNi 2 Al 3 are rather similar to those of itinerant compounds, suggesting that U 5 f electrons in these compounds are well hybridized with ligand states. On the other hand, the core-level spectra of UPd ...

New Magnetic State in Incommensurate Magnetic Phase of Heavy-Fermion Superconductor CeRh0.6Co0.4In5

We performed elastic neutron scattering experiments on solid solution CeRh 1- x Co x In 5 with x =0.4 to clarify the nature of the antiferromagnetic (AF) phase in the vicinity of the quantum critic...

Itinerant magnetism in URhGe revealed by angle-resolved photoelectron spectroscopy

The electronic structure of the ferromagnetic superconductor URhGe in the paramagnetic phase has been studied by angle-resolved photoelectron spectroscopy using soft x rays (

Magnetic instability induced by Rh doping in the Kondo semiconductor CeRu2Al10

h\ensuremath{\nu}=595

Electronic structures of ferromagnetic superconductorsUGe2and UCoGe studied by angle-resolved photoelectron spectroscopy

--700 eV). Dispersive bands with large contributions from U 5

Magnetic order in the pyrochlore iridate Nd2Ir2O7probed by muon spin relaxation

f

Time-Reversal Symmetry in the Hidden Order and Superconducting States of URu2Si2

states were observed in the ARPES spectra and form Fermi surfaces. The band structure in the paramagnetic phase is partly explained by the band-structure calculation treating all U 5

Parity violation in a single domain of spin-triplet Sr2RuO4 superconductors

f

Possible Evolution of Antiferromagnetism in Zn-Doped Heavy-Fermion Superconductor CeCoIn5

electrons as being itinerant, suggesting that an itinerant description of U 5