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 …

Spin-triplet superconductors are of extensive current interest because they can host
topological state and Majorana fermions important for quantum computation. The uranium …

A second-order phase transition is characterized by spontaneous symmetry breaking. The
nature of the broken symmetry in the so-called “hidden-order” phase transition in the heavy …

Complex electronic matter shows subtle forms of self-organization, which are almost
invisible to the available experimental tools. One prominent example is provided by the …

Exotic electronic states resulting from entangled spin and orbital degrees of freedom are
hallmarks of strongly correlated f-electron systems. A spectacular example is the so-called …

Heavy electronic states originating from the f atomic orbitals underlie a rich variety of
quantum phases of matter. We use atomic scale imaging and spectroscopy with the …

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 …

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 …

Shubnikov–de Haas measurements of high quality URu 2 Si 2 single crystals reveal two
previously unobserved Fermi surface branches in the so-called hidden order phase …