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Symmetry and Correlations Underlying Hidden Order in URu2Si2



Nicholas P. Butch, Michael E. Manley, Jason R. Jeffries, Marc Janoschek, Kevin Huang, M. Brian Maple, Ayman H. Said, Bogdan M. Leu, Jeffrey W. Lynn


The organization of correlated electrons in the Hidden Order (HO) phase of intermetallic URu2Si2 is a longstanding mystery. In this work, we study the symmetry by mapping the lattice and magnetic excitations via inelastic neutron and x-ray scattering measurements in the NO and high-temperature paramagnetic phases. The HO phase emerges from a highly-directionally correlated paramagnetic phase that gives rise to anisotropic bulk properties. However, at all temperatures the excitations respect the zone edges and symmetries of the body-centered tetragonal paramagnetic phase, showing no signs of reduced lattice symmetry even in the HO phase. Moreover, the magnetic excitations trace the experimentally determined Fermi surface, and their evolution with temperature marks them as a direct signature of itinerant correlations. At the HO phase transition, the opening of energy gaps in the magnetic excitations reflects a change in the hybridization of the many-body correlated state due to an order parameter that preserves the lattice symmetry.
Physical Review B


Condensed Matter Physics, Strongly Correlated Materials, Magnetism


Butch, N. , , M. , , J. , Janoschek, M. , Huang, K. , , M. , , A. , , B. and Lynn, J. (2015), Symmetry and Correlations Underlying Hidden Order in URu<sub>2</sub>Si<sub>2</sub>, Physical Review B, [online], (Accessed June 12, 2024)


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Created January 26, 2015, Updated February 19, 2017