Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6

IF 6.2 1区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY npj Quantum Materials Pub Date : 2025-03-29 DOI:10.1038/s41535-025-00748-5

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

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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 \({\mathcal{S}}(Q,\omega )\) 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.

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基塔耶夫蜂窝状铱酸D3LiIr2O6的连续磁激励

粉末D3(7Li)(193Ir)2O6的非弹性中子散射（INS）测量结果表明，粉末D3(7Li)(193Ir)2O6具有低能磁激发，散射截面在∣Q∣宽，并具有能量转移。纵向极化中子散射证明了激发谱的磁性。由磁散射截面推断出的总磁矩为1.8(4)μB/Ir，与磁化率数据推断出的有效磁矩以及对Jeff = 1/2单离子态的期望相一致。对于5 meV，动态相关函数\({\mathcal{S}}(Q,\omega )\)的上升可以用一个简单的模型来描述，假设最近邻各向异性自旋交换，就像Kitaev模型中发现的那样。与D位点相关的交换紊乱可能在稳定低T量子波动态中起重要作用1,2。

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来源期刊

npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

10.60

自引率

3.50%

发文量

107

审稿时长

6 weeks

期刊介绍： npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.