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<p>The deuterium isotope effect on the honeycomb iridate H<sub>3</sub>LiIr<sub>2</sub>O<sub>6</sub>, a quantum spin-orbit-entangled liquid, was examined by synthesizing D<sub>3</sub>LiIr<sub>2</sub>O<sub>6</sub>. The structural refinements indicate the different character of the interlayer OH and OD bonds, which results in a giant isotope effect on the magnetic interactions; the antiferromagnetic Curie-Weiss temperature |<i>θ</i><sub>CW</sub>| of D<sub>3</sub>LiIr<sub>2</sub>O<sub>6</sub> increases to ~ 170 K from ~ 100 K of H<sub>3</sub>LiIr<sub>2</sub>O<sub>6</sub>. Nevertheless, the quantum liquid state is robust against the deuterium isotope exchange in contrast to the theoretical prediction that the Kitaev spin liquid is stable only for a limited phase space of magnetic interactions. The bond- and site disorders associated with disordered OD(H) bonds, in combination with Kitaev physics, may play a role in realizing the quantum liquid state.</p>

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Robust quantum spin liquid state in the presence of giant magnetic isotope effect in D3LiIr2O6

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月17日

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  • T. Takayama,
  • A. S. Gibbs,
  • K. Kitagawa,
  • Y. Matsumoto,
  • K. Ishii,
  • A. Kato,
  • R. Takano,
  • S. Bette,
  • R. Dinnebier,
  • H. Takagi

摘要

The deuterium isotope effect on the honeycomb iridate H3LiIr2O6, a quantum spin-orbit-entangled liquid, was examined by synthesizing D3LiIr2O6. The structural refinements indicate the different character of the interlayer OH and OD bonds, which results in a giant isotope effect on the magnetic interactions; the antiferromagnetic Curie-Weiss temperature |θCW| of D3LiIr2O6 increases to ~ 170 K from ~ 100 K of H3LiIr2O6. Nevertheless, the quantum liquid state is robust against the deuterium isotope exchange in contrast to the theoretical prediction that the Kitaev spin liquid is stable only for a limited phase space of magnetic interactions. The bond- and site disorders associated with disordered OD(H) bonds, in combination with Kitaev physics, may play a role in realizing the quantum liquid state.