Spin Structure Models of YFeO<sub>3</sub> from THz Spectroscopy Study

ORAL

Abstract

In YFeO3 iron spins S=5/2 arrange in an antiferromagnetic (AFM) canted state Γ4(Ga,Fc,Ab) well above room temperature. With four spins per unit cell, its spin structure is described by a combination of exchange interactions, Dzyaloshinskii-Moriya (DM) interactions, and single-ion anisotropies (SIA). Since only Fe ions have the non-zero magnetic moment, this compound is a perfect modelling system for spin interactions and a step towards understanding more complex materials, possibly those with multiferroic properties.
We measured absorption of THz radiation in single crystals at the temperature 3 K in magnetic fields up to B = 17 T. THz spectroscopy can measure two out of four spin wave (SW) modes in YFeO3, those with zero-field energies 1.2 and 2.4 meV. Combining the B dependence of the SW modes with earlier inelastic neutron scattering results, we were able to quantify the parameters of DM interactions and SIA more precisely than was previously possible. We then evaluated different models of the spin structure and determined the one that represents magnetic interactions most accurately.

*We acknowledge 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

  • Kirill Amelin

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

Authors

  • Kirill Amelin

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

  • Urmas Nagel

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

  • Randy Fishman

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Lab, Oak Ridge, Tennessee, USA

  • Yoshiyuki Yoshida

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

  • Hasung Sim

    • Department of Physics & Astronomy, Seoul National University, Seoul, Korea

  • Kisoo Park

    • Department of Physics & Astronomy, Seoul National University, Seoul, Korea

  • Je-Guen Park

    • Department of Physics and Astronomy, Seoul National University
    • Center for Correlated Electron Systems, Institute for Basic Science & Seoul National Univeristy
    • 2 Center for Correlated Electron Systems, institute for Basic Science; and 3 Department of Physics and Astronomy ,Seoul National University, Seoul, South Korea
    • Department of Physics and Astronomy, Seoul National University (SNU)
    • Seoul National University
    • Department of Physics & Astronomy, Seoul National University, Seoul, Korea
    • Center for Correlated Electron Systems, Institute for Basic Science (IBS), Korea

  • Toomas Room

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