Gapped excitations in the high-pressure antiferromagnetic phase of URu2Si2

Abstract

The nature of the ``hidden order'' phase of URu${}_{2}$Si${}_{2}$ continues to defy understanding, despite three decades of intense research. Nonetheless, progress has been made in identifying key properties of the ``hidden order'' phase, including the observation of spin correlations indicative of Fermi surface nesting by neutron scattering. Here, the authors show that these spin correlations appear in the pressure-induced antiferromagnetic phase of URu${}_{2}$Si${}_{2}$, with remarkably similar properties. The persistence of these magnetic correlations suggests a significant kinship between these phases that had not been previously appreciated.