Inelastic Neutron Scattering measurements on phonon-magnon coupling in BiFeO<sub>3</sub>

ORAL

Abstract

We use inelastic neutron scattering to study phonons in multiferroic BiFeO3. When the low energy optic phonon is probed, an intensity enhancement is observed when the system enters the antiferromagnetic phase at TN=640K. It is interpreted as a possble dynamic coupling between phonons and magnons through the DM interaction. Polarized neutron measurements are performed to confirm the lattice nature of this enhancement, in other words, to show that this is more a "magneto-phonon" mode rather than a "electro-magnon" mode. We will also discuss neutron scattering measurements on higher energy phonons that could also be affected by the proposed dynamic coupling.

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Presenters

  • Guangyong Xu

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NCNR, NIST
    • NIST Center for Neutron Research

Authors

  • Guangyong Xu

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NCNR, NIST
    • NIST Center for Neutron Research

  • Zhijun Xu

    • NIST Center for neutron research, National Institute of Standard and Technology, Gaithersburg, MD
    • University of Maryland, College Park and NIST
    • National Institute of Standards and Technology

  • John A. Schneeloch

    • Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science, Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • University of Virginia

  • Jinsheng Wen

    • Nanjing University

  • Masaaki Matsuda

    • Neutron Sciences Directorate, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Neutron Science Directorate, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Barry L. Winn

    • Oak Ridge National Laboratory
    • Neutron Science Directorate, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Daniel Pajerowski

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Yang Zhao

    • University of Maryland - College Park
    • NIST Center for neutron research, National Institute of Standard and Technology, Gaithersburg, MD
    • National Institute of Standards and Technology

  • Chris Stock

    • University of Edinburgh
    • Physics, University of Edinburgh
    • U. Edingburgh
    • Univ of Edinburgh

  • Peter M Gehring

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • NCNR, NIST
    • National Institute of Standards and Technology

  • T. ushiyama

    • AIST, Japan

  • Y. Yanagisawa

    • AIST, Japan

  • Y. Tomioka

    • AIST, Japan

  • Toshimitsu Ito

    • AIST
    • National Institute of Advanced Industrial Science and Technology (AIST)
    • AIST, Japan

  • Robert J Birgeneau

    • University of California, Berkeley
    • Physics, University of California, Berkeley
    • Univ. of California, Berkeley
    • Physics, University of California Berkeley