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<p>The spiral spin liquid (SSL) is a highly degenerate state characterized by a continuous contour or surface in reciprocal space spanned by a spiral propagation vector. Although the SSL state has been predicted in a number of various theoretical models, very few materials are so far experimentally identified to host such a state. Via combined single-crystal wide-angle and small-angle neutron scattering, we report observation of the SSL in the quasi-two-dimensional delafossite-like AgCrSe<sub>2</sub>. We show that it is a very close realization of the ideal Heisenberg <i>J</i><sub>1</sub>–<i>J</i><sub>2</sub>–<i>J</i><sub>3</sub> frustrated model on the triangular lattice. By supplementing our experimental results with microscopic spin-dynamics simulations, we demonstrate how such exotic magnetic states are driven by thermal fluctuations and exchange frustration.</p>

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Observation of the spiral spin liquid in a triangular-lattice material

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月17日

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  • N. D. Andriushin,
  • S. E. Nikitin,
  • Ø. S. Fjellvåg,
  • J. S. White,
  • A. Podlesnyak,
  • D. S. Inosov,
  • M. C. Rahn,
  • M. Schmidt,
  • M. Baenitz,
  • A. S. Sukhanov

摘要

The spiral spin liquid (SSL) is a highly degenerate state characterized by a continuous contour or surface in reciprocal space spanned by a spiral propagation vector. Although the SSL state has been predicted in a number of various theoretical models, very few materials are so far experimentally identified to host such a state. Via combined single-crystal wide-angle and small-angle neutron scattering, we report observation of the SSL in the quasi-two-dimensional delafossite-like AgCrSe2. We show that it is a very close realization of the ideal Heisenberg J1–J2–J3 frustrated model on the triangular lattice. By supplementing our experimental results with microscopic spin-dynamics simulations, we demonstrate how such exotic magnetic states are driven by thermal fluctuations and exchange frustration.