Γ3-type Lattice Instability and the Hidden Order of URu2Si2

Abstract

We have performed ultrasonic measurements on single-crystalline URu2Si2 with pulsed magnetic fields, in order to check for possible lattice instabilities due to the hybridized state and the hidden-order state of this compound. The elastic constant (C11-C12)/2, which is associated with a response to the Γ3-type symmetry-breaking (orthorhombic) strain field, shows a three-step increase at H > 35 T for H || c at low temperatures, where successive meta-magnetic transitions are observed in the magnetization. We discovered a new fact that the absolute change of the softening of (C11-C12)/2 in the temperature dependence is quantitatively recovered at the suppression of hybridized-electronic state and the hidden order in high-magnetic field for H \perp c associated with the successive transitions. The present results suggest that the Γ3-type lattice instability, is related to both the emergence of the hybridized electronic state and the hidden-order parameter of URu2Si2. On the other hand, magnetic fields H || [100] and [110] enhance the softening of (C11-C12)/2 in the hidden order phase, while no step-like anomaly is observed up to 68.7 T. We discuss the limitation of the localized-electron picture for describing these features of URu2Si2 by examination of a crystalline electric field model in terms of mean-field theory.

arXiv comment12 pages, 3 figures

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Cited by in corpus (12)

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• Lattice dynamics of the heavy fermion compound URu${}_2$Si${}_2$
• Hybridization-Driven Orthorhombic Lattice Instability in URu2Si2
• Search for Multipolar Instability in URu${}_2$Si${}_2$ Studied by Ultrasonic Measurements under Pulsed Magnetic Field
• Fermi surface in the hidden-order state of URu${}_2$Si${}_2$ under intense pulsed magnetic fields up to 81~T
• Inelastic x-ray scattering measurements on URu2Si2
• Magnetoelastic phenomena in antiferromagnetic uranium intermetallics: the $\mathrm{UA}{\mathrm{u}}_2\mathrm{S}{\mathrm{i}}_2$ case
• Ultrasonic Study of the Hidden Order and Heavy-Fermion State in URu${}_2$Si${}_2$ with Hydrostatic Pressure, Rh-doping, and High-Magnetic Fields
• Spin-orbit density wave: A new phase of matter applicable to the hidden order state of URu2Si2
• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering
• Elastic properties of hidden order in URu${}_{\text{2}}$Si${}_{\text{2}}$ are reproduced by a staggered nematic