Search for multipolar instability in URu2Si2 studied by ultrasonic measurements under pulsed magnetic field

T. Yanagisawa, S. Mombetsu, H. Hidaka, H. Amitsuka, P. T. Cong, S. Yasin, S. Zherlitsyn, J. Wosnitza, K. Huang, N. Kanchanavatee, M. Janoschek, M. B. Maple, and D. Aoki
Phys. Rev. B 97, 155137 – Published 17 April 2018

Abstract

The elastic properties of URu2Si2 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 5f-electron properties, since the unidentified electronic thermodynamic phase of unknown origin, the so-called “hidden order” (HO), and associated hybridization of conduction and f electrons (cf hybridization) are suppressed at high magnetic fields. From the three different transverse modes we find contrasting results; both the Γ4(B2g) and Γ5(Eg) symmetry modes C66 and C44 show elastic softening that is enhanced above 30 T, while the characteristic softening of the Γ3(B1g) symmetry mode (C11C12)/2 is suppressed in high magnetic fields. These results underscore the presence of a hybridization-driven Γ3(B1g) lattice instability in URu2Si2. However, the results from this work cannot be explained by using existing crystalline electric field schemes applied to the quadrupolar susceptibility in a local 5f2 configuration. Instead, we present an analysis based on a band Jahn-Teller effect.

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  • Received 16 February 2018
  • Revised 31 March 2018

DOI:https://doi.org/10.1103/PhysRevB.97.155137

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

T. Yanagisawa1,*, S. Mombetsu1, H. Hidaka1, H. Amitsuka1, P. T. Cong2, S. Yasin2, S. Zherlitsyn2, J. Wosnitza3,2, K. Huang4, N. Kanchanavatee4, M. Janoschek4,5, M. B. Maple4, and D. Aoki6,7

  • 1Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
  • 2Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 3Institut für Festkörperphysik und Materialphysik, TU Dresden, 01062 Dresden, Germany
  • 4Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
  • 5Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 6IMR, Tohoku University, Oarai, Ibaraki 311-1313, Japan
  • 7INAC/PHELIQS, CEA-Grenoble, 38054 Grenoble, France

  • *tatsuya@phys.sci.hokudai.ac.jp

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Vol. 97, Iss. 15 — 15 April 2018

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