Inelastic Neutron Scattering measurements on phonon-magnon coupling in BiFeO3

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.

–

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