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MA: Fachverband Magnetismus

MA 40: Frustrated Magnets II

MA 40.3: Vortrag

Donnerstag, 21. März 2024, 15:30–15:45, H 1058

Observation of the spiral spin liquid in a triangular-lattice antiferromagnet AgCrSe₂ — •Nikita Andriushin¹, Stanislav Nikitin², Øystein Fjellvåg^2,3, Jonathan White², Andrey Podlesnyak⁴, Dmytro Inosov^1,5, Marcus Schmidt⁶, Michael Baenitz⁶, and Aleksandr Sukhanov¹ — ¹TU Dresden, Germany — ²PSI, Switzerland — ³IFE, Norway — ⁴ORNL, USA — ⁵ct.qmat, Germany — ⁶MPI CPfS, Germany

The spiral spin liquid (SSL) is a highly degenerate state characterized by a continuous contour or surface in reciprocal space spanned by the spiral propagation vector. Although the SSL state has already been discussed for a number of theoretical models, only a very few materials were so far experimentally identified to host such a state. We report an observation of SSL in the quasi-two-dimensional delafossite AgCrSe₂, which is an ideal realization of the Heisenberg J₁–J₂–J₃ bond-frustration model on the triangular lattice. To demonstrate this, we combined single-crystal neutron diffraction measurements and microscopic spin-dynamics simulations. Our results show how exotic correlated magnetic states can be induced by a combination of thermal fluctuations and frustration, and establish AgCrSe₂ as a model system to study the SSL state.

Keywords: spiral spin liquid; triangular lattice; neutron scattering