Spin Structure Models of YFeO3 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.

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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