THz spectroscopy of spin excitations in magnetoelectric LiCoPO<sub>4</sub> in high magnetic fields

ORAL

Abstract

LiCoPO4 belongs to the family of magnetoelectric lithium-orthophosphates. In these compounds the cross-coupling between magnetization and electric polarization leads to variety of spin excitations that have entangled dynamic electric and magnetic properties. In this work THz spectroscopy was used to measure absorption spectra of spin excitations in LiCoPO4 single crystal below antiferromagnetic ordering temperature and in magnetic field up to 32 T. Three spin flop transitions for the magnetic field parallel to the magnetic easy axis were identified from the magnetic field dependence of spin excitations and from the magnetic field dependence of magnetization. Using polarized light and ME poling to create a single ME domain [V. Kocsis et al. PRL121, 057601 (2018), PRB100, 155124 (2019)], the selection rules of spin excitations were determined. Several magnetic-, electric-dipole active and magnetoelectric resonances were found.

*Part of the work was supported by The Estonian Ministry of Education and Research under Grant No. IUT23-03, and the European Regional Development Fund project TK134.

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Presenters

  • Laur Peedu

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

Authors

  • Laur Peedu

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Toomas Room

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Johan Viirok

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Urmas Nagel

    • National Institute of Chemical Physics and Biophysics
    • National Institute of Chemical Physics and Biophysics, Estonia

  • Sandor Bordacs

    • Budapest University of Technology and Economics
    • Department of Physics, Budapest University of Technology and Economics and MTA-BME, Hungary
    • Department of Physics, Budapest University of Technology and Economics, Hungary

  • Vilmos Kocsis

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • Department of Physics, Budapest University of Technology and Economics, Hungary
    • Leibniz Institute for Solid State and Materials Research Dresden
    • RIKEN CEMS

  • Yusuke Tokunaga

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • Department of Advanced Materials Science, University of Tokyo
    • Univ of Tokyo-Kashiwanoha

  • Yasujiro Taguchi

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • RIKEN CEMS

  • Yoshinori Tokura

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • CEMS, RIKEN
    • RIKEN CEMS and University of Tokyo
    • Center for Emergent Matter Science (CEMS), RIKEN
    • RIKEN CEMS
    • Department of Applied Physics, The University of Tokyo
    • The University of Tokyo
    • Center for Emergent Matter Science, RIKEN
    • RIKEN Center for Emergent Matter Science

  • Hans Engelkamp

    • High Field Magnet Laboratory, Radboud University
    • High Field Magnet Laboratory, Radboud University, The Netherlands

  • Uli Zeitler

    • High Field Magnet Laboratory, Radboud University
    • HFML Radboud University Nijmegen

  • Istvan Kezsmarki

    • University of Augsburg
    • Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Germany
    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg