Magnetic Excitations and Interactions in the Kitaev Hyperhoneycomb Iridate $\beta$-Li$_2$IrO$_3$

Thomas Halloran; Yishu Wang; Mengqun Li; Ioannis Rousochatzakis; Prashant Chauhan; M. B. Stone; Tomohiro Takayama; Hidenori Takagi; N. P. Armitage; Natalia B. Perkins; Collin Broholm

doi:10.1103/PhysRevB.106.064423

Magnetic Excitations and Interactions in the Kitaev Hyperhoneycomb Iridate $\beta$-Li$_2$IrO$_3$

Strongly Correlated Electrons 2022-08-31 v3

Authors: Thomas Halloran , Yishu Wang , Mengqun Li , Ioannis Rousochatzakis , Prashant Chauhan , M. B. Stone , Tomohiro Takayama , Hidenori Takagi , N. P. Armitage , Natalia B. Perkins , Collin Broholm

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Abstract

We present a thorough experimental study of the three-dimensional hyperhoneycomb Kitaev magnet $\beta$ -Li $_2$ IrO $_3$ , using a combination of inelastic neutron scattering (INS), time-domain THz spectroscopy, and heat capacity measurements. The main results include a massive low-temperature reorganization of the INS spectral weight that evolves into a broad peak centered around 12 meV, and a distinctive peak in the THz data at 2.8(1) meV. A detailed comparison to powder-averaged spin-wave theory calculations reveals that the positions of these two features are controlled by the anisotropic $\Gamma$ coupling and the Heisenberg exchange $J$ , respectively. The refined microscopic spin model places $\beta$ -Li $_2$ IrO $_3$ in close proximity to the Kitaev spin liquid phase.

Keywords

magnetic excitations Kitaev hyperhoneycomb iridate β-Li2IrO3 inelastic neutron scattering THz spectroscopy spin-wave theory Kitaev spin liquid

Cite

@article{arxiv.2204.12403,
  title  = {Magnetic Excitations and Interactions in the Kitaev Hyperhoneycomb Iridate $\beta$-Li$_2$IrO$_3$},
  author = {Thomas Halloran and Yishu Wang and Mengqun Li and Ioannis Rousochatzakis and Prashant Chauhan and M. B. Stone and Tomohiro Takayama and Hidenori Takagi and N. P. Armitage and Natalia B. Perkins and Collin Broholm},
  journal= {arXiv preprint arXiv:2204.12403},
  year   = {2022}
}

Magnetic Excitations and Interactions in the Kitaev Hyperhoneycomb Iridate $\beta$-Li$_2$IrO$_3$

Abstract

Keywords

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