Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β-Li2IrO3

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 β-Li2IrO3

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 β-Li2IrO3, 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-Li2IrO3 in close proximity to the Kitaev spin liquid phase.

Original language	English (US)
Article number	064423
Journal	Physical Review B
Volume	106
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.106.064423
State	Published - Aug 1 2022
Externally published	Yes

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© 2022 American Physical Society.

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title = "Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β-Li2IrO3",

abstract = "We present a thorough experimental study of the three-dimensional hyperhoneycomb Kitaev magnet β-Li2IrO3, 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-Li2IrO3 in close proximity to the Kitaev spin liquid phase.",

author = "Thomas Halloran and Yishu Wang and Mengqun Li and Ioannis Rousochatzakis and Prashant Chauhan and Stone, {M. B.} and Tomohiro Takayama and Hidenori Takagi and Armitage, {N. P.} and Perkins, {Natalia B.} and Collin Broholm",

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doi = "10.1103/PhysRevB.106.064423",

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T1 - Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β-Li2IrO3

AU - Halloran, Thomas

AU - Wang, Yishu

AU - Li, Mengqun

AU - Rousochatzakis, Ioannis

AU - Chauhan, Prashant

AU - Stone, M. B.

AU - Takayama, Tomohiro

AU - Takagi, Hidenori

AU - Armitage, N. P.

AU - Perkins, Natalia B.

AU - Broholm, Collin

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We present a thorough experimental study of the three-dimensional hyperhoneycomb Kitaev magnet β-Li2IrO3, 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-Li2IrO3 in close proximity to the Kitaev spin liquid phase.

AB - We present a thorough experimental study of the three-dimensional hyperhoneycomb Kitaev magnet β-Li2IrO3, 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-Li2IrO3 in close proximity to the Kitaev spin liquid phase.

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DO - 10.1103/PhysRevB.106.064423

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JF - Physical Review B

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Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate β-Li2IrO3

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