We have measured the far-infrared reflectance of the heavy-fermion compound URu 2 Si 2
through the phase transition at T HO= 17.5 K dubbed “hidden order” with light polarized …

We summarize existing optical data of URu2Si2 to clarify the nature of the hidden order
transition in this heavy fermion metal. Hybridization develops between 50 K and 17.5 K, and …

We present data on the optical conductivity of URu 2− x (Fe, Os) x Si 2. While the parent
material URu 2 Si 2 enters the enigmatic hidden order (HO) phase below 17.5 K, an …

We performed far-infrared optical spectroscopy measurements on the heavy fermion
compound URu 2 Si 2 as a function of temperature. The light's electric field was applied …

The detail of electronic structures near the Fermi level in URu 2 Si 2 has been investigated
employing state-of-art laser angle-resolved photoemission spectroscopy. The observation of …

We present the in-plane optical reflectance measurement on single crystals of URu 2 Si 2.
The study revealed a strong temperature-dependent spectral evolution. Above 50 K, the low …

We studied the spectral functions of URu 2 Si 2 in the hidden-order state by means of
ultrahigh-resolution angle-resolved photoemission spectroscopy. High signal-to-noise ratio …

We present a detailed temperature and frequency dependence of the optical conductivity
measured on clean high-quality single crystals of URu 2 Si 2 of ac-and ab-plane surfaces …

To elucidate the underlying nature of the hidden order (HO) state in heavy-fermion
compound URu 2 Si 2, we measure electrical transport properties of ultraclean crystals in a …

A phenomenological model for the “hidden order” transition in the heavy-Fermion material
URu 2 Si 2 is introduced. The hidden order is identified as an incommensurate, momentum …