Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β–Li2⁢IrO3

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

doi:10.1103/physrevb.106.064423

Title: Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β–Li₂⁢IrO₃

Journal Article · 17 August 2022 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.106.064423 · OSTI ID:2429877

^[1]; Wang, Yishu ^[2]; Li, Mengqun ^[3];

^[4];

^[1];

^[5]; Takayama, Tomohiro ^[6]; Takagi, Hidenori ^[7]; Armitage, N. P. ^[1]; Perkins, Natalia B. ^[3];

^[2]

Johns Hopkins Univ., Baltimore, MD (United States)
Johns Hopkins Univ., Baltimore, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of Minnesota, Minneapolis, MN (United States)
Loughborough Univ. (United Kingdom)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Max Planck Institute of Solid State Research, Stuttgart (Germany)
Max Planck Institute of Solid State Research, Stuttgart (Germany); Univ. of Tokyo (Japan)

Here, we present a thorough experimental study of the three-dimensional hyperhoneycomb Kitaev magnet β–Li₂⁢IrO₃, using a combination of inelastic neutron scattering (INS), time-domain terahertz spectroscopy (TDTS), 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 terahertz 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 Γ coupling and the Heisenberg exchange J, respectively. The refined microscopic spin model places β–Li₂⁢IrO₃ in close proximity to the Kitaev spin liquid phase.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725; SC0018056; SC0019331

OSTI ID:: 2429877

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β–Li2⁢IrO3

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Title: Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β–Li₂⁢IrO₃