THz spectroscopy of spin waves in multiferroic LiFePO<sub>4</sub> in high magnetic fields

ORAL

Abstract

LiFePO4 belongs to the family of multiferroic lithium ortho phosphates compounds where the entanglement of magnetization and electric polarization leads to variety of magnon modes in the THz range that have dynamic electric and magnetic properties. Thus it is important to study THz absorption selection rules of magnons to understand the magneto electric properties of these materials. LiFePO4 orders antiferromagnetically below 50 K. We used THz absorption spectroscopy to measure magnon excitations in LiFePO4 single crystals below 5 K in zero and in magnetic fields up to 17 T. Several optically active magnons were observed. From the polarization dependence of absorbed THz radiation we found magnetic- and electric-dipole active magnons, and also a prototypical example of magneto-electric excitation.

*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 & Biophysics

Authors

  • Laur Peedu

    • National Institute of Chemical Physics & Biophysics

  • Toomas Room

    • National Institute of Chemical Physics & Biophysics
    • National Institute of Chemical Physics and Biophysics

  • Urmas Nagel

    • National Institute of Chemical Physics & Biophysics
    • National Institute of Chemical Physics and Biophysics

  • Sandor Bordäcs

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

  • Istvan Kezsmarki

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

  • Vilmos Kocsis

    • RIKEN Center for Emergent Matter Science (CEMS)

  • Yusuke Tokunaga

    • RIKEN Center for Emergent Matter Science (CEMS)

  • Yasujiro Taguchi

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

  • Yoshinori Tokura

    • RIKEN Center for Emergent Matter Science (CEMS)
    • CEMS, RIKEN
    • RIKEN
    • Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo
    • RIKEN Center for Emergent Matter Science
    • Center for Emergent Matter Science (CEMS), RIKEN
    • Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo