Symmetry and correlations underlying Hidden Order in URu2Si2

Abstract

We experimentally investigate the symmetry in the Hidden Order (HO) phase of intermetallic URu2Si2 by mapping the lattice and magnetic excitations via inelastic neutron and x-ray scattering measurements in the HO and high-temperature paramagnetic phases. At all temperatures the excitations respect the zone edges of the body-centered tetragonal paramagnetic phase, showing no signs of reduced spatial symmetry, even in the HO phase. The magnetic excitations originate from transitions between hybridized bands and track the Fermi surface, whose feature are corroborated by the phonon measurements. Due to a large hybridization energy scale, a full uranium moment persists in the HO phase, consistent with a lack of observed crystal-field-split states. Our results are inconsistent with local order parameter models and the behavior of typical density waves. We suggest that an order parameter that does not break spatial symmetry would naturally explain these characteristics.

16 pages, 13 figures The scope of this work was expanded to include much more magnetic neutron scattering as well as inelastic x-ray scattering. The modes originally identified as soft phonons are magnetic. Many of the figures had their quality reduced in order to fit the arxiv file size limits. Please see the PRB article for higher quality images

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• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• Probing 5f-state configurations in URu2Si2 with U L3-edge resonant x-ray emission spectroscopy
• Chemical pressure tuning of URu${}_2$Si${}_2$ via isoelectronic substitution of Ru with Fe
• Ultra-High Resolution Neutron Spectroscopy of Low-Energy Spin Dynamics in UGe${}_2$
• Lattice dynamics of the heavy fermion compound URu${}_2$Si${}_2$
• Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce${}_{1-x}$La${}_x$B${}_6$ and Ce${}_{1-x}$Nd${}_x$B${}_6$
• Isoelectronic perturbations to $f$-$d$-electron hybridization and the enhancement of hidden order in URu${}_2$Si${}_2$
• Distinct magnetic spectra in the hidden order and antiferromagnetic phases in URu2-xFexSi2
• Hidden Order Signatures in the Antiferromagnetic Phase of U(Ru${}_{1-x}$Fe${}_x$)${}_2$Si${}_2$
• High-energy magnetic excitations from heavy quasiparticles in CeCu${}_2$Si${}_2$
• Inelastic x-ray scattering measurements on URu2Si2
• Gapped Excitations in the High-Pressure Antiferromagnetic Phase of URu${}_2$Si${}_2$
• From hidden-order to antiferromagnetism: electronic structure changes in Fe-doped URu${}_2$Si${}_2$
• Collective spin resonance excitation in the gapped itinerant multipole hidden order phase of URu2Si2
• Quasiparticle Relaxation Dynamics in URu${}_{2-x}$Fe${}_x$Si${}_2$ Single Crystals
• The hidden order in URu2Si2: Symmetry-induced anti-toroidal vortices
• One-dimensional moire charge density wave in the hidden order state of URu2Si2 induced by fracture
• Ungapped magnetic excitations beyond Hidden Order in URu${}_{2-x}$Re${}_x$Si${}_2$
• Collinear antiferromagnetic order in URu${}_2$Si${}_{2-x}$P${}_x$ revealed by neutron diffraction