This Colloquium reviews the 25 year quest to understand the continuous (second-order),
mean-field-like phase transition occurring at 17.5 K in URu 2 Si 2. About ten years ago, the …

This topical review describes the multitude of unconventional behaviors in the hidden order,
heavy fermion, antiferromagnetic and superconducting phases of the intermetallic …

Research on actinide materials, both basic and applied, has been greatly advanced by the
general techniques available from high-intensity photon beams from x-ray synchrotron …

A second-order phase transition in a physical system is associated with the emergence of an
“order parameter” and a spontaneous symmetry breaking. The heavy fermion …

Throughout the past three decades, the hidden order (HO) problem in URu2Si2 has
remained a 'hot topic'in the physics of strongly correlated electron systems with well over …

The recent discovery of superconductivity in paramagnetic UTe2 turns spotlight on a serious
candidate for spin-triplet state. To draw a complete picture of the superconducting state in …

The multipole concept, which characterizes the spacial distribution of scalar and vector
objects by their angular dependence, has already become widely used in various areas of …

We report a comprehensive electronic structure investigation of the paramagnetic (PM), the
large moment antiferromagnetic (LMAF), and the hidden order (HO) phases of URu 2 Si 2 …

A procedure for quantifying the U 5 f electronic covalency and degree of localization in U
intermetallic compounds is presented. To this end, bulk sensitive hard and soft x-ray …

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 …