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  • Letter

Stripe order and spin dynamics in the triangular-lattice antiferromagnet KErSe2: A single-crystal study with a theoretical description

Gaofeng Ding1,2,*, Hongliang Wo1,2,*, Rui Leonard Luo3,*, Yimeng Gu1,2, Yiqing Gu1,2, Robert Bewley4, Gang Chen3,†, and Jun Zhao1,2,5,6,‡

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
  • 2Shanghai Qi Zhi Institute, Shanghai 200232, China
  • 3Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong, The University of Hong Kong, Hong Kong, China
  • 4ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
  • 5Institute of Nanoelectronics and Quantum Computing, Fudan University, Shanghai 200433, China
  • 6Shanghai Research Center for Quantum Sciences, Shanghai 201315, China

  • *These authors contributed equally to this work
  • †gangchen@hku.hk
  • ‡zhaoj@fudan.edu.cn
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Phys. Rev. B 107, L100411 – Published 15 March, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L100411

Abstract

The rare-earth triangular-lattice chalcogenide is a great platform for exploring both spin liquids and novel magnetic orders with anisotropic spin interactions and magnetic frustrations. Here, we report the thermodynamic and neutron-scattering measurements of rare-earth triangular-lattice chalcogenide KErSe2, using single-crystal samples. Our experiments revealed a long-range stripe order below 0.2 K. Although the magnetic order was three dimensional, magnetic excitations exhibited negligible modulation along the z direction, indicating very weak interlayer coupling. Furthermore, magnetic excitation developed a well-defined spin-wave dispersion with a gap of ∼0.03meV at M points. Both the stripe order and spin-wave excitations could be quantitatively understood from the anisotropic spin interactions of the Er3+ Kramers doublets.

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Phys. Rev. B 107, L100411– Published 15 March, 2023
  • Received 27 October 2022
  • Accepted 3 March 2023
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