Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6

Thomas Halloran; Yishu Wang; K. W. Plumb; M. B. Stone; Barry Winn; M. K. Graves-Brook; J. A. Rodriguez-Rivera; Yiming Qiu; Prashant Chauhan; Johannes Knolle; Roderich Moessner; N. P. Armitage; Tomohiro Takayama; Hidenori Takagi; Collin Broholm

doi:10.1038/s41535-025-00748-5

Continuum of magnetic excitations in the Kitaev honeycomb iridate D₃LiIr₂O₆

Thomas Halloran
, Yishu Wang
, K. W. Plumb
, M. B. Stone
, Barry Winn
, M. K. Graves-Brook
, J. A. Rodriguez-Rivera
, Yiming Qiu
, Prashant Chauhan
, Johannes Knolle
, Roderich Moessner
, N. P. Armitage
, Tomohiro Takayama
, Hidenori Takagi
, Collin Broholm

Chair of Theory of Quantum Matter

Johns Hopkins University
NIST Center for Neutron Research
University of Maryland
University of Tennessee
University of Tennessee
Brown University
Oak Ridge National Laboratory
University of Maryland, College Park
Munich Center for Quantum Science and Technology (MCQST)
Imperial College London
MPI für Physik Komplexer Systeme
Max Planck Institute for Solid State Research
University of Tokyo
Johns Hopkins University

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Inelastic neutron scattering (INS) measurements of powder D₃(⁷Li)(¹⁹³Ir)₂O₆ reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣Q∣ and energy transfer. The magnetic nature of the excitation spectrum is demonstrated by longitudinally polarized neutron scattering. The total magnetic moment of 1.8(4)μ_B/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the J_eff = 1/2 single ion state. The rise in the dynamic correlation function S(Q,ω) for ℏω < 5 meV can be described by a simple model assuming nearest-neighbor anisotropic spin exchange, such as that found in the Kitaev model. Exchange disorder associated with the D site likely plays an important role in stabilizing the low T quantum fluctuating state^1,2.

Original language	English
Article number	35
Journal	npj Quantum Materials
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41535-025-00748-5
State	Published - Dec 2025

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Halloran, T., Wang, Y., Plumb, K. W., Stone, M. B., Winn, B., Graves-Brook, M. K., Rodriguez-Rivera, J. A., Qiu, Y., Chauhan, P., Knolle, J., Moessner, R., Armitage, N. P., Takayama, T., Takagi, H., & Broholm, C. (2025). Continuum of magnetic excitations in the Kitaev honeycomb iridate D₃LiIr₂O₆. npj Quantum Materials, 10(1), Article 35. https://doi.org/10.1038/s41535-025-00748-5

@article{53460a72655b46c6b71f45301346fa05,

title = "Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6",

abstract = "Inelastic neutron scattering (INS) measurements of powder D3(7Li)(193Ir)2O6 reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣Q∣ and energy transfer. The magnetic nature of the excitation spectrum is demonstrated by longitudinally polarized neutron scattering. The total magnetic moment of 1.8(4)μB/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the Jeff = 1/2 single ion state. The rise in the dynamic correlation function S(Q,ω) for ℏω < 5 meV can be described by a simple model assuming nearest-neighbor anisotropic spin exchange, such as that found in the Kitaev model. Exchange disorder associated with the D site likely plays an important role in stabilizing the low T quantum fluctuating state1,2.",

author = "Thomas Halloran and Yishu Wang and Plumb, \{K. W.\} and Stone, \{M. B.\} and Barry Winn and Graves-Brook, \{M. K.\} and Rodriguez-Rivera, \{J. A.\} and Yiming Qiu and Prashant Chauhan and Johannes Knolle and Roderich Moessner and Armitage, \{N. P.\} and Tomohiro Takayama and Hidenori Takagi and Collin Broholm",

note = "Publisher Copyright: {\textcopyright} This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2025.",

year = "2025",

month = dec,

doi = "10.1038/s41535-025-00748-5",

language = "English",

volume = "10",

journal = "npj Quantum Materials",

issn = "2397-4648",

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TY - JOUR

T1 - Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6

AU - Halloran, Thomas

AU - Wang, Yishu

AU - Plumb, K. W.

AU - Stone, M. B.

AU - Winn, Barry

AU - Graves-Brook, M. K.

AU - Rodriguez-Rivera, J. A.

AU - Qiu, Yiming

AU - Chauhan, Prashant

AU - Knolle, Johannes

AU - Moessner, Roderich

AU - Armitage, N. P.

AU - Takayama, Tomohiro

AU - Takagi, Hidenori

AU - Broholm, Collin

PY - 2025/12

Y1 - 2025/12

N2 - Inelastic neutron scattering (INS) measurements of powder D3(7Li)(193Ir)2O6 reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣Q∣ and energy transfer. The magnetic nature of the excitation spectrum is demonstrated by longitudinally polarized neutron scattering. The total magnetic moment of 1.8(4)μB/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the Jeff = 1/2 single ion state. The rise in the dynamic correlation function S(Q,ω) for ℏω < 5 meV can be described by a simple model assuming nearest-neighbor anisotropic spin exchange, such as that found in the Kitaev model. Exchange disorder associated with the D site likely plays an important role in stabilizing the low T quantum fluctuating state1,2.

AB - Inelastic neutron scattering (INS) measurements of powder D3(7Li)(193Ir)2O6 reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣Q∣ and energy transfer. The magnetic nature of the excitation spectrum is demonstrated by longitudinally polarized neutron scattering. The total magnetic moment of 1.8(4)μB/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the Jeff = 1/2 single ion state. The rise in the dynamic correlation function S(Q,ω) for ℏω < 5 meV can be described by a simple model assuming nearest-neighbor anisotropic spin exchange, such as that found in the Kitaev model. Exchange disorder associated with the D site likely plays an important role in stabilizing the low T quantum fluctuating state1,2.

UR - https://www.scopus.com/pages/publications/105001502661

U2 - 10.1038/s41535-025-00748-5

DO - 10.1038/s41535-025-00748-5

M3 - Article

AN - SCOPUS:105001502661

SN - 2397-4648

VL - 10

JO - npj Quantum Materials

JF - npj Quantum Materials

IS - 1

M1 - 35

ER -

Continuum of magnetic excitations in the Kitaev honeycomb iridate D₃LiIr₂O₆

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