Resonant X-ray Scattering Study of Quadrupolar Ordering in DyB$_4$

POSTER

Abstract

Resonant x-ray scattering was performed on DyB$_4$ to observe a quadrupolar ordering. It is demonstrated that anisotropic tensor susceptibility (ATS) resonances due to ordering in Dy $4f$ states can be seperated from those due to atomic displacements, such as Jahn-Teller distortion, by tuning the incident x-ray energies. An ATS resonance at 7.792 keV, corresponding to antiferro-type quadrupolar (AFQ) ordering, was observed to have different azimuthal angular dependence and polarizations from those of magnetic resonance. The AFQ order parameter is developed concomitantly with monoclinic phase transition below 12.3 K, and its magnitude is proportional to quadratic of the monoclinic angle.

Authors

  • Sungdae Ji

  • C. Song

  • J. Koo

  • K.-B. Lee

    • eSSC and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
    • POSTECH
    • eSSC and Dept. of Physics, Pohang University of Science and Technology, Pohang, 790-784, South Korea

  • Y.J. Park

    • Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 790-784, South Korea

  • J.S. Rhyee

  • B.K. Cho

    • Center for Frontier Materials and Dept. of Materials Science and Engineering, GIST, Gwangju, 500-712, South Korea