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© The Author(s) 2025. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

We combine ultra-high-resolution inelastic neutron scattering and quantum Monte Carlo simulations to study thermodynamics and spin excitations in the spin-supersolid phase of the triangular lattice XXZ antiferromagnet K2Co(SeO3)2 under zero and non-zero magnetic field. BKT transitions signaling the onset of Ising and supersolid order are clearly identified, and the Wannier entropy is experimentally recovered just above the supersolid phase. At low temperatures, with an experimental resolution of about 23 μeV, no discrete coherent magnon modes are resolved within a broad scattering continuum. Alongside gapless excitations, a pseudo-Goldstone mode with a 0.06 meV gap is observed. A second, higher-energy continuum replaces single-spin-flip excitations of the Ising model. Under applied fields, the continuum evolves into coherent spin waves, with Goldstone and pseudo-Goldstone sectors responding differently. The experiments and simulations show excellent quantitative agreement.

Details

Title
Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2
Author
Zhu, M. 1 ; Chinellato, Leandro M. 2 ; Romerio, V. 1 ; Murai, N. 3 ; Ohira-Kawamura, S. 3 ; Balz, Christian 4 ; Yan, Z. 1 ; Gvasaliya, S. 1 ; Kato, Yasuyuki 5 ; Batista, C. D. 6 ; Zheludev, A. 1 

 ETH Zürich, Laboratory for Solid State Physics, Zürich, Switzerland (GRID:grid.5801.c) (ISNI:0000 0001 2156 2780) 
 The University of Tennessee, Department of Physics, Knoxville, USA (GRID:grid.411461.7) (ISNI:0000 0001 2315 1184) 
 Japan Atomic Energy Agency, J-PARC Center, Tokai, Japan (GRID:grid.20256.33) (ISNI:0000 0001 0372 1485) 
 STFC Rutherford Appleton Laboratory, ISIS Neutron and Muon Source, Didcot, UK (GRID:grid.76978.37) (ISNI:0000 0001 2296 6998); Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, USA (GRID:grid.135519.a) (ISNI:0000 0004 0446 2659) 
 University of Fukui, Department of Applied Physics, Fukui, Japan (GRID:grid.163577.1) (ISNI:0000 0001 0692 8246) 
 The University of Tennessee, Department of Physics, Knoxville, USA (GRID:grid.411461.7) (ISNI:0000 0001 2315 1184); Oak Ridge National Laboratory, Quantum Condensed Matter Division and Shull-Wollan Center, Oak Ridge, USA (GRID:grid.135519.a) (ISNI:0000 0004 0446 2659) 
Pages
74
Publication year
2025
Publication date
2025
Publisher
Nature Publishing Group
e-ISSN
23974648
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3227340555
Copyright
© The Author(s) 2025. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.