NQR investigation of low frequency spin dynamics in Kitaev spin liquid candidate material Cu<sub>2</sub>IrO<sub>3</sub> in zero magntic field

ORAL

Abstract

Cu2IrO3 [1] is a Kitaev spin liquid candidate material with nearly ideal honeycomb planes consisting of Ir magnetic moments, and does not exhibit a bulk magnetic long range order. We report 63,65Cu Nuclear Quadrupole Resonance (NQR) investigation of Cu2IrO3 in zero external magnetic field [2]. Unlike the case of the celebrated sister compound Na2IrO3 or α-RuCl3 with a bulk antiferromagnetic ground state below TN, spin dynamics reflected on the NMR relaxation rate 1/T1 does not show a divergent behavior caused by conventional magnons. We can therefore probe the intrinsic low energy spin excitations of the Kitaev planes using NQR in zero magnetic field in a broad window of temperature.

[1] M. Abramchuk, F. Tafti et al., JACS 139, 15371 (2017).
[2] S. K. Takahashi, J. Wang et al., preprint (to be published).

*The work at McMaster was supported by NSERC and CIFAR. The work at Boston College was supported by NSF DMR-5104811.

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Presenters

  • Takashi Imai

    • Dept. of Physics and Astronomy, McMaster University

Authors

  • Sean K S Takahashi

    • Dept. of Physics and Astronomy, McMaster University

  • Jiaming Wang

    • Dept. of Physics and Astronomy, McMaster University

  • Alexandre Arsenault

    • Dept. of Physics and Astronomy, McMaster University

  • Mykola Abramchuk

    • Physics, Boston College
    • Department of Physics, Boston College
    • Dept. of Physics, Boston College
    • Boston College

  • Fazel Fallah Tafti

    • Department of Physics, Boston College
    • Physics, Boston College
    • Dept. of Physics, Boston College
    • Boston College

  • Philip Singer

    • Dept. of Chemical and Biomolecular Engineering, Rice University

  • Sung-Sik Lee

    • Dept. of Physics and Astronomy, McMaster University

  • Takashi Imai

    • Dept. of Physics and Astronomy, McMaster University