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<p>Inelastic neutron scattering (INS) measurements of powder D<sub>3</sub>(<sup>7</sup>Li)(<sup>193</sup>Ir)<sub>2</sub>O<sub>6</sub> reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣<i>Q</i>∣ 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)<i>μ</i><sub><i>B</i></sub>/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the <i>J</i><sub>eff</sub> = 1/2 single ion state. The rise in the dynamic correlation function <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41535_2025_748_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="58" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathcal{S}}(Q,\omega )\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi class="MJX-tex-caligraphic" mathvariant="script">S</mi> <mrow> <mo>(</mo> <mrow> <mi>Q</mi> <mo>,</mo> <mi>ω</mi> </mrow> <mo>)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> for <i>ℏ</i><i>ω</i> &lt; 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 <i>T</i> quantum fluctuating state<sup><CitationRef CitationID="CR1">1</CitationRef>,<CitationRef CitationID="CR2">2</CitationRef></sup>.</p>

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Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月29日

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  • 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

摘要

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