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

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Other Title
  • Search for multipolar instability in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>URu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> studied by ultrasonic measurements under pulsed magnetic field

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 (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-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 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 5f(2) configuration. Instead, we present an analysis based on a band Jahn-Teller effect.

Journal

  • Physical Review B

    Physical Review B 97 (15), 155137-, 2018-04-17

    American Physical Society (APS)

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