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<p>Spin-orbit entangled materials have attracted widespread interest due to the novel magnetic phenomena arising from the interplay between spin-orbit coupling and electronic correlations. However, the intricate nature of spin interactions within Kiteav materials complicates the precise measurement of low-energy spin excitations. Using Na<sub>2</sub>Co<sub>2</sub>TeO<sub>6</sub> as an example, we study these low-energy spin excitations using the time-resolved resonant elastic x-ray scattering (tr-REXS). Our observations unveil remarkably slow spin dynamics at the magnetic peak, whose recovery timescale is several nanoseconds. This timescale aligns with the extrapolated spin gap of ~1 <i>μ</i>eV, obtained by density matrix renormalization group (DMRG) simulations in the thermodynamic limit. The consistency demonstrates the efficacy of tr-REXS in discerning low-energy spin gaps inaccessible to conventional spectroscopic techniques.</p>

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Using magnetic dynamics to measure the spin gap in a candidate Kitaev material

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月1日

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  • Xinyi Jiang,
  • Qingzheng Qiu,
  • Cheng Peng,
  • Hoyoung Jang,
  • Wenjie Chen,
  • Xianghong Jin,
  • Li Yue,
  • Byungjune Lee,
  • Sang-Youn Park,
  • Minseok Kim,
  • Hyeong-Do Kim,
  • Xinqiang Cai,
  • Qizhi Li,
  • Tao Dong,
  • Nanlin Wang,
  • Joshua J. Turner,
  • Yuan Li,
  • Yao Wang,
  • Yingying Peng

摘要

Spin-orbit entangled materials have attracted widespread interest due to the novel magnetic phenomena arising from the interplay between spin-orbit coupling and electronic correlations. However, the intricate nature of spin interactions within Kiteav materials complicates the precise measurement of low-energy spin excitations. Using Na2Co2TeO6 as an example, we study these low-energy spin excitations using the time-resolved resonant elastic x-ray scattering (tr-REXS). Our observations unveil remarkably slow spin dynamics at the magnetic peak, whose recovery timescale is several nanoseconds. This timescale aligns with the extrapolated spin gap of ~1 μeV, obtained by density matrix renormalization group (DMRG) simulations in the thermodynamic limit. The consistency demonstrates the efficacy of tr-REXS in discerning low-energy spin gaps inaccessible to conventional spectroscopic techniques.