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THz spectroscopy of BiFeO<sub>3</sub> in the magnetic-field-induced canted AFM state.

ORAL

Abstract

BiFeO3 is a well-known room temperature multiferroic material where the cycloidal magnetic order induces electric polarization in addition to existing polarization. The cycloidal order is transformed by strong magnetic fields into a canted antiferromagnetic (AFM) order above B=18T and the cycloidal modes are replaced by excitations of the canted AFM structure [U. Nagel et al., Phys. Rev. Lett., 110:257201, (2013)].
Here we present the THz spectroscopy results for three different magnetic field orientation, parallel to hexagonal c axis, perpendicular and parallel to a axis, measured on the single FE domain crystals grown by the laser-diode heating floating-zone method [T. Ito et al., Cryst. Growth Des. 11 (2011) 5139]. The dependence of mode frequencies as a function of magnetic field were studied up to 35T at liquid He temperatures. In light of these experimental results, a microscopic model is proposed for the canted AF phase.

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Presenters

  • Johan Viirok

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

Authors

  • Johan Viirok

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

  • Laur Peedu

    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

  • Toomas Room

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

  • Dávid Szaller

    Institute of Solid State Physics, Vienna University of Technology, Austria

  • 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

  • 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

  • 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

  • Hans Engelkamp

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

  • Dima Kamensky

    High Field Magnet Laboratory, Radboud University, The Netherlands

  • Komalavalli Thirunavukkuarasu

    National High Magnetic Field Laboratory, Tallahassee, FL, Florida A&M University, Natl High Magnetic Field Lab

  • Mykhaylo Ozerov

    National High Magnetic Field Laboratory, Tallahassee, FL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, Natl High Magnetic Field Lab

  • Dmitry Smirnov

    Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Tallahassee, FL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, national high magnetic field laboratory

  • Jurek Krzystek

    National High Magnetic Field Laboratory, Tallahassee, FL

  • Yukihiro Ozaki

    National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • Toshimitsu Ito

    National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • Yasuhide Tomioka

    National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • Trinanjan Datta

    Department of Chemistry and Physics, Augusta University, Augusta, GA, Chemistry and Physics, Augusta University

  • Randy Fishman

    Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, Materials Science and Technology Division, OakRidge National Laboratory