Phase-slip residual-order spin state in FeSe
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866911675658010624 |
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| author | Liu, Zhixin Fan, Jiyu Zhang, Lei Chunlan, Ma Ji, Yanda Yang, Zhongqin Zhu, Yan |
| author_facet | Liu, Zhixin Fan, Jiyu Zhang, Lei Chunlan, Ma Ji, Yanda Yang, Zhongqin Zhu, Yan |
| contents | Clarifying the magnetic ground state is essential for analysing unconventional superconductivity, because microscopic magnetic order provides one of the basic starting assumptions for spin-fluctuation pairing theories. FeSe exhibits pronounced stripe- and Neel-type spin fluctuations yet lacks static long-range order, posing a long-standing puzzle. By combining PBE and r2SCAN mixed exchange-correlation calculations with spectrally weighted simulations of the static spin structure factor S(q), we show that FeSe is not governed by a single magnetic configuration but by a nearly degenerate manifold of phase-slip defects embedded in a stripe background. We term this state a residual-order spin state (ROSS): a spin state that retains local stripe-like antiferromagnetic correlations but loses long-range phase coherence because of phase slips. Multiple slip configurations are compressed into an exceptionally narrow energy window. Non-local magneto-elastic coupling redistributes domain-wall formation energy through the lattice, whereas competing magnetic interactions truncate the real-space coherence length to an optimal scale of about ten moments. Weighted superpositions of these slip states reproduce the momentum-space line shapes of both stripe- and Neel-type spin fluctuations observed by inelastic neutron scattering, providing a microscopic basis for superconductivity models built on spin fluctuations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_12293 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Phase-slip residual-order spin state in FeSe Liu, Zhixin Fan, Jiyu Zhang, Lei Chunlan, Ma Ji, Yanda Yang, Zhongqin Zhu, Yan Superconductivity Strongly Correlated Electrons Clarifying the magnetic ground state is essential for analysing unconventional superconductivity, because microscopic magnetic order provides one of the basic starting assumptions for spin-fluctuation pairing theories. FeSe exhibits pronounced stripe- and Neel-type spin fluctuations yet lacks static long-range order, posing a long-standing puzzle. By combining PBE and r2SCAN mixed exchange-correlation calculations with spectrally weighted simulations of the static spin structure factor S(q), we show that FeSe is not governed by a single magnetic configuration but by a nearly degenerate manifold of phase-slip defects embedded in a stripe background. We term this state a residual-order spin state (ROSS): a spin state that retains local stripe-like antiferromagnetic correlations but loses long-range phase coherence because of phase slips. Multiple slip configurations are compressed into an exceptionally narrow energy window. Non-local magneto-elastic coupling redistributes domain-wall formation energy through the lattice, whereas competing magnetic interactions truncate the real-space coherence length to an optimal scale of about ten moments. Weighted superpositions of these slip states reproduce the momentum-space line shapes of both stripe- and Neel-type spin fluctuations observed by inelastic neutron scattering, providing a microscopic basis for superconductivity models built on spin fluctuations. |
| title | Phase-slip residual-order spin state in FeSe |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.12293 |