Order-by-disorder from Schwinger bosons in a frustrated honeycomb ferromagnet Article Swipe
The cobalt-based honeycomb magnet BaCo$_2$(AsO$_4$)$_2$ (BCAO) has recently emerged as a promising platform for studying frustrated magnetism beyond conventional paradigms. Neutron-scattering experiments and first-principles calculations have revealed an unexpected double-zigzag (dZZ) magnetically ordered ground state, whose microscopic origin remains under active debate. Here, we investigate the emergence of such dZZ phase in a ferro-antiferromagnetic $J_1$-$J_3$ Heisenberg model on the honeycomb lattice, using a generalized Schwinger boson mean-field theory ($g$-SBMFT) that treats ferromagnetic and antiferromagnetic interactions on equal footing. Based on $g$-SBMFT and exact-diagonalization (ED) techniques, we find that the dZZ is selected by an order-by-disorder mechanism in a narrow $J_3/|J_1|$ range, in agreement with recent density-matrix renormalization-group calculations. The magnetic excitation spectra within the dZZ phase displays a distinctive smearing out in momentum space due to quantum fluctuations which may be probed through inelastic neutron-scattering experiments.
Related Topics
- Type
- article
- Landing Page
- http://arxiv.org/abs/2511.16429
- https://arxiv.org/pdf/2511.16429
- OA Status
- green
- OpenAlex ID
- https://openalex.org/W7106476194
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W7106476194Canonical identifier for this work in OpenAlex
- Title
-
Order-by-disorder from Schwinger bosons in a frustrated honeycomb ferromagnetWork title
- Type
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articleOpenAlex work type
- Publication year
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2025Year of publication
- Publication date
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2025-11-20Full publication date if available
- Authors
-
Ralko Arnaud, Merino, JaimeList of authors in order
- Landing page
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https://arxiv.org/abs/2511.16429Publisher landing page
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https://arxiv.org/pdf/2511.16429Direct link to full text PDF
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YesWhether a free full text is available
- OA status
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greenOpen access status per OpenAlex
- OA URL
-
https://arxiv.org/pdf/2511.16429Direct OA link when available
- Concepts
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Physics, Ferromagnetism, Boson, Condensed matter physics, Magnetism, Honeycomb, Antiferromagnetism, Quantum, Phase (matter), Position and momentum space, Quantum mechanics, Magnet, Momentum (technical analysis), Heisenberg model, Excitation, Parameter space, Frustration, Spectral line, Ground state, Quantum fluctuation, Space (punctuation), Magnetic field, Honeycomb structure, Phase space, Theoretical physics, Quantum dotTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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