Hybridization-Driven Orthorhombic Lattice Instability in URu2Si2

Abstract

We have measured the elastic constant (C11-C12)/2 in URu2Si2 by means of high-frequency ultrasonic measurements in pulsed magnetic fields H || [001] up to 61.8 T in a wide temperature range from 1.5 to 116 K. We found a reduction of (C11-C12)/2 that appears only in the temperature and magnetic field region in which URu2Si2 exhibits a heavy-electron state and hidden-order. This change in (C11-C12)/2 appears to be a response of the 5f-electrons to an orthorhombic and volume conservative strain field ε_xx-ε_yy with Γ3-symmetry. This lattice instability is likely related to a symmetry-breaking band instability that arises due to the hybridization of the localized f electrons with the conduction electrons, and is probably linked to the hidden-order parameter of this compound.

5 pages, 4 figures

References in corpus (4)

• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Emergent Rank-5 'Nematic' Order in URu2Si2
• Importance of In-Plane Anisotropy in the Quasi Two-Dimensional Antiferromagnet BaNi${}_2$V${}_2$O${}_8$
• Γ3-type Lattice Instability and the Hidden Order of URu2Si2

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• From hidden-order to antiferromagnetism: electronic structure changes in Fe-doped URu${}_2$Si${}_2$
• Ultrasonic Study of the Hidden Order and Heavy-Fermion State in URu${}_2$Si${}_2$ with Hydrostatic Pressure, Rh-doping, and High-Magnetic Fields
• Collinear antiferromagnetic order in URu${}_2$Si${}_{2-x}$P${}_x$ revealed by neutron diffraction
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