Spin Seebeck effect in quasi-2D antiferromagnet BaNi2V2O8 with signatures of the Berezinskii-Kosterlitz-Thouless transition

ORAL

Abstract

The spin Seebeck effect (SSE) is useful for elucidating spin excitation and transport of magnetic states. Among exotic magnetic states, two-dimensional (2D) spin systems, in which a quasi-long-range order emerges owing to enhanced spin fluctuations, are interesting because their spin transport remains unclear. In this study, we investigate the SSE in a quasi-2D antiferromagnet BaNi2V2O8. BaNi2V2O8 has been reported to exhibit Berezinskii-Kosterlitz-Thouless (BKT)-like behavior, highlighting its distinct 2D character and quasi-long-range order [1,2]. We experimentally found that SSE signals in Pt/BaNi2V2O8 decrease with increasing temperature and persist well above the Néel temperature. Our numerical calculations showed that the observed temperature dependence of the SSE signals is linked to the strong magnetic correlations in the BKT-like phase.





[1] N. Rogado, et al., Phys. Rev. B 65, 144443 (2002).

[2] E. S. Klyushina, et al., Phys. Rev. B 104, 64402 (2021).

* This work was carried out by joint research of the Cryogenic Research Center, the University of Tokyo. This work was supported by Japan Science and Technology Agency (JST) FOREST Program, Grant No. JPMJFR203H, and by Japan Society for the Promotion of Science (JSPS) KAKENHI, Grants No. 22H05449, No. 22H04464, No. 23H01832, No. 19H05600, No. 23H04576, No. 23H01392, No. 22KJ1068, No. 21H01794, and No. 23H04582. K.N. is supported by Research Fellowships of Japan Society for the Promotion of Science for Young Scientists.

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Presenters

  • Kurea Nakagawa

    The University of Tokyo

Authors

  • Kurea Nakagawa

    The University of Tokyo

  • Minoru Kanega

    Chiba University

  • Tomoyuki Yokouchi

    The University of Tokyo

  • Masahiro Sato

    Chiba University

  • Yuki Shiomi

    The University of Tokyo