Long-range magnetic order in the magnetodielectric regime of Ce<sub>2</sub>O<sub>3</sub>

ORAL

Abstract

The metastable sesquioxide, Ce2O3, has been a material of intense interest in recent years due to reports of an anomalous giant magnetodielectric effect and the emergence of vibronic modes below a putative antiferromagnetic transition at TN = 6.2K. The claim of long-range magnetic order in this material is based on heat capacity and temperature-dependent susceptibility measurements. Curiously, three previous neutron diffraction studies were unable to distinguish any magnetic Bragg peaks, casting doubt on the nature of the low temperature state. To address this point, we undertook a comprehensive study of polycrystalline Ce2O3 using neutron diffraction, triple-axis and time-of-flight inelastic neutron scattering, and muon spin rotation. I will report evidence of magnetic order in Ce2O3 and discuss these results in light of our current understanding of the underlying physics.

–

Presenters

  • Alexandra N Cote

    • University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champai

Authors

  • Alexandra N Cote

    • University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champai

  • Astha Sethi

    • University of Illinois at Urbana-Champaign

  • Dalmau Reig-i-Plessis

    • University of British Columbia

  • Taras Kolodiazhnyi

    • National Institute for Materials Science

  • Qiang Zhang

    • Oak Ridge National Laboratory

  • Devashibhai T Adroja

    • ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom Funding
    • STFC Rutherford Appleton Laboratory

  • Alannah M Hallas

    • University of British Columbia

  • Jeffrey W Lynn

    • National Institute of Standards and Tech
    • National Institute of Standards and Technology

  • S. Lance Cooper

    • University of Illinois at Urbana-Champaign

  • Greg MacDougall

    • University of Illinois at Urbana-Champai
    • University of Illinois at Urbana-Champaign
    • University of Illinois