Search for Multipolar Instability in URu${}_2$Si${}_2$ Studied by Ultrasonic Measurements under Pulsed Magnetic Field

Abstract

The elastic properties of URu${}_2$Si${}_2$ in the high-magnetic field region above 40 T, over a wide temperature range from 1.5 to 120 K, were systematically investigated by means of high-frequency ultrasonic measurements. The investigation was performed at high magnetic fields to better investigate the innate bare 5$f$-electron properties, since the unidentified electronic thermodynamic phase of unknown origin, so called `hidden order'(HO) and associated hybridization of conduction and $f$-electron ($c$-$f$ hybridization) are suppressed at high magnetic fields. From the three different transverse modes we find contrasting results; both the ${\Gamma }_4$(B${}_{2g}$) and ${\Gamma }_5$(E${}_{\mathrm{g}}$) symmetry modes $C_{66}$ and $C_{44}$ show elastic softening that is enhanced above 30 T, while the characteristic softening of the ${\Gamma }_3$(B${}_{1g}$) symmetry mode $(C_{11}-C_{12})/2$ is suppressed in high magnetic fields. These results underscore the presence of a hybridization-driven ${\Gamma }_3$(B${}_{1g}$) lattice instability in URu${}_2$Si${}_2$. However, the results from this work cannot be explained by using existing crystalline-electric field (CEF) schemes applied to the quadrupolar susceptibility in a local $5f^2$ configuration. Instead, we present an analysis based on a band Jahn-Teller effect.

11 pages, 6 figures

References in corpus (24)

• Colloquium: Hidden Order, Superconductivity, and Magnetism -- The Unsolved Case of URu2Si2
• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Arrested Kondo effect and hidden order in URu_2Si_2
• Hidden Orbital Order in $UR{u}_{2}S{i}_2$
• Structural quantum criticality and superconductivity in iron-based superconductor Ba(Fe1-xCox)2As2
• Emergent Rank-5 'Nematic' Order in URu2Si2
• Chirality density wave of the 'hidden order' phase in URu${}_2$Si${}_2$
• A Hierarchically-Organized Phase Diagram near a Quantum Critical Point in URu2Si2
• Group theory and octupolar order in URu2Si2
• On the Hidden Order in URu${}_2$Si${}_2$ --- Antiferro Hexadecapole Order and its Consequences
• Effective Spin Models for Spin-Phonon Chains by Flow Equations
• Evidence for a nematic component to the Hidden Order parameter in URu2Si2 from differential elastoresistance measurements
• Direct observation of lattice symmetry breaking at the hidden-order transition in URu2Si2
• Hidden and antiferromagnetic order as a rank-5 superspin in URu2Si2
• Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2
• Field-induced spin-density wave beyond hidden order in URu2Si2
• Direct bulk sensitive probe of 5f symmetry in URu2Si2
• Interplay of magnetism, Fermi surface reconstructions, and hidden-order in the heavy-fermion material URu${}_2$Si${}_2$
• Symmetry of the Excitations in the Hidden Order State of 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
• Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor
• Hybridization-Driven Orthorhombic Lattice Instability in URu2Si2
• High-magnetic field lattice length changes in URu2Si2

Cited by in corpus (10)

• Hidden order and beyond: an experimental-theoretical overview of the multifaceted behavior of URu${}_2$Si${}_2$
• One-Component Order Parameter in URu${}_2$Si${}_2$ Uncovered by Resonant Ultrasound Spectroscopy and Machine Learning
• Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y${}_{1-x}$Pr${}_x$Ir${}_2$Zn${}_{20}$
• Pressure-Induced Rotational Symmetry Breaking in URu${}_2$Si${}_2$
• Field-angle resolved magnetic excitations as a probe of hidden-order symmetry in CeB6
• Chiral charge as hidden order parameter in URu${}_2$Si${}_2$
• High-Field Ultrasonic Study of Quadrupole Ordering and Crystal Symmetry Breaking in CeRhIn5
• Non-Fermi liquid behavior and quantum criticality in cubic heavy fermion systems with non-Kramers multipolar local moments
• Magnetoelastic coupling in URu2Si2: Probing multipolar correlations in the hidden order state
• From hidden-order to antiferromagnetism: electronic structure changes in Fe-doped URu${}_2$Si${}_2$