The nature of the second-order phase transition that occurs in URu 2 Si 2 at 17.5 K remains
puzzling despite intensive research. A key question emerging in the field is whether a …

We study URu 2-x Fe x Si 2, in which two types of staggered phases compete at low
temperature as the iron concentration x is varied: the nonmagnetic “hidden order”(HO) …

We study, using high-resolution angle-resolved photoemission spectroscopy, the evolution
of the electronic structure in URu 2 Si 2 at the Γ, Z, and X high-symmetry points from the high …

Fermi showed that, as a result of their quantum nature, electrons form a gas of particles
whose temperature and density follow the so-called Fermi distribution. As shown by Landau …

We experimentally investigate the symmetry in the hidden order (HO) phase of intermetallic
URu 2 Si 2 by mapping the lattice and magnetic excitations via inelastic neutron and x-ray …

Kondo insulators and in particular their noncubic representatives have remained poorly
understood. Here we report on the development of an anisotropic energy pseudogap in the …

URu 2 Si 2 is surely one of the most mysterious of the heavy-fermion compounds. Despite
more than 20 years of experimental and theoretical works, the order parameter of the …

Previous high-resolution angle-resolved photoemission (ARPES) studies of URu 2 Si 2 have
characterized the temperature-dependent behavior of narrow-band states close to the Fermi …

CeCoSi with no local inversion symmetric crystal structure (P 4/nmm) exhibits a phase
transition of unknown origin (Hidden Order: HO) at about 12 K (T 0) above the …

We report a comprehensive investigation of the lattice dynamics of URu 2 Si 2 as a function
of temperature using Raman scattering, optical conductivity, and inelastic neutron scattering …