Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet Gd<sub>2</sub>PdSi<sub>3</sub>

ORAL

Abstract

Frustrated magnets provide abundant opportunities for discovering complex spin textures, which sometimes yield unconventional electromagnetic responses in correlated electron systems. It is theoretically predicted that magnetic frustration may also promote a topologically nontrivial spin state [1], i.e., magnetic skyrmions. Empirically, however, skyrmions are essentially concomitant with noncentrosymmetric lattice structures or interfacial symmetry-breaking heterostructures [2]. Here, we report the emergence of a Bloch-type skyrmion state in a frustrated centrosymmetric triangular-lattice magnet Gd2PdSi3 [3]. We identified the field-induced skyrmion phase via a giant topological Hall response, which is further corroborated by the observation of in-plane spin modulation probed by resonant x-ray scattering. Our results exemplify a new platform of magnetic frustration for producing topological spin textures endowed with emergent electrodynamics in centrosymmetric magnets.
[1] C. D. Batista et al., Rep. Prog. Phys. 79, 084504 (2016).
[2] A. Fert et al., Nat. Nanotech. 8, 152 (2013).
[3] T. Kurumaji et al., arXiv:1805.10719.

*This research was supported in part by JSPS Grant-in-Aid No. 24224009, No. 17K14351, and No. 16H05990, and by PRESTO No. JPMJPR177A from JST.

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Presenters

  • Takashi Kurumaji

    • Physics, MIT
    • Department of Applied Physics, University of Tokyo

Authors

  • Takashi Kurumaji

    • Physics, MIT
    • Department of Applied Physics, University of Tokyo

  • Taro Nakajima

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

  • Max Hirschberger

    • RIKEN Center for Emergent Matter Science

  • Akiko Kikkawa

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

  • Yuichi Yamasaki

    • University of Tokyo

  • Hajime Sagayama

    • KEK
    • High Energy Accelerator Research Organization

  • Hironori Nakao

    • KEK

  • Yasujiro Taguchi

    • RIKEN Center for Emergent Matter Science (CEMS)
    • RIKEN Center for Emergent Matter Science
    • RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan
    • Center for Emergent Matter Science (CEMS), RIKEN
    • RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.

  • Takahisa Arima

    • University of Tokyo

  • Yoshinori Tokura

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