Magnetic structure and spin dynamics of a buckled-honeycomb antiferromagnet Co4Ta2O9

ORAL

Abstract

Controlling magnetism by the electric field is one of the most important topics in correlated materials, which could be realized via magnetoelectric (ME) coupling. The discovery of ME in Cr2O3 [1] initiates intense research on related ME materials for practical applications. However, there are not many real materials that show strong ME coupling due to rather strict symmetrical conditions: the absence of the inversion and time-reversal symmetry.

The interest was renewed when the Co4Nb2O9 study found a large ME coupling with an antiferromagnetic ordering [2]. Keeping this interest, we present a combined measurement of magnetic susceptibility, neutron diffraction and inelastic neutron scattering on Co4Ta2O9 [3]. We determined a magnetic order by single-crystal neutron diffraction and also performed inelastic neutron scattering to prove spin dynamics. We will discuss the implication of our results on the magnetic structure and spin excitations in the context of the magnetoelectricity of this material.

[1] I. E. Dzyaloshinskii, Sov. Phys. JETP 10, 628 (1960).
[2] N. D. Khanh et al, PRB 93, 075117 (2016); G. Deng et al, PRB 97, 085154 (2018).
[3] S. Choi et al (in preparation).

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Presenters

  • Sungkyun Choi

    • Rutgers University, Piscataway
    • Department of Physics and Astronomy, Rutgers University, New Brunswick
    • Rutgers University

Authors

  • Sungkyun Choi

    • Rutgers University, Piscataway
    • Department of Physics and Astronomy, Rutgers University, New Brunswick
    • Rutgers University

  • Valery Kiryukhin

    • Rutgers University
    • Rutgers University, Piscataway
    • Department of Physics and Astronomy, Rutgers University, New Brunswick

  • Matthias J Gutmann

    • ISIS Neutron and Muon Source
    • Rutherford Appleton Laboratory

  • David J Voneshen

    • ISIS Neutron and Muon Source

  • Shangke Pan

    • Department of Physics and Astronomy, Rutgers University, New Brunswick

  • Sang-Wook Cheong

    • Rutgers University
    • R-CEM & Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Rutgers Center for Emergent Materials, Rutgers University
    • Department of Physics and Astronomy, Center for Emergent Materials, Rutgers University; Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technol
    • Physics and Astronomy, Rutgers University
    • Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Rutgers University, Piscataway
    • Department of Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics, Rutgers University
    • Physics & Astronomy, Rutgers University
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Physics, Rutgers University
    • Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA