Néel-type skyrmion lattice in tetragonal polar magnet VOSe<sub>2</sub>O<sub>5</sub>

ORAL

Abstract

VOSe2O5 has been known to form a tetragonal polar lattice with the space group P4cc and to exhibit a ferrimagnetic-like transition at TC = 7.5 K [1-3]. We synthesized the single crystals and performed the detailed magnetization study to reveal the versatile magnetic phases in a low-field region (H < 100 Oe) including the “A phase” close to the TC. We perform the SANS investigation and obtain the experimental evidence for the phase transition between cycloidal helimagnetic phase and the triangular skyrmion-lattice phase to demonstrate the Neel-type skyrmion lattice formation in the present system. We identified another magnetic phase of an incommensurate spin texture at lower temperatures under a finite magnetic field, tentatively assigned to a square skyrmion-lattice phase. These findings exemplify the versatile features of Néel-type skyrmions in bulk materials, and provide a further opportunity to explore the physics of topological spin textures in polar magnets.
[1] S.-H. Kim, et al., Chem. Mater. 22, 5074 (2010).
[2] P. G. Meunier et al., Acta Cryst. B30, 2834 (1974).
[3] J.-C. Trombe et al., Nouv. J. Chimie, 11, 321 (1987).

*This research was supported in part by JSPS Grant-In-Aid for Scientific Research(S) No. 24224009, and Grant-In-Aid for Young Scientists(B) No. 17K14351.

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Presenters

  • Takashi Kurumaji

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

Authors

  • Takashi Kurumaji

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

  • Taro Nakajima

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

  • Victor Ukleev

    • RIKEN Center for Emergent Matter Science

  • Artem Feoktystov

    • Julich Centre for Neutron Science (JCNS)

  • Taka-hisa Arima

    • Department of Advanced Materials Science, University of Tokyo
    • CEMS, RIKEN
    • The University of Tokyo and RIKEN CEMS
    • Univ of Tokyo

  • Kazuhisa Kakurai

    • Comprehensive Research Organization for Science and Society (CROSS), Neutron Science and Technology Center
    • CROSS-Tokai

  • 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