| Autor: |
Ma, Mingwei, Bourges, Philippe, Sidis, Yvan, Sun, Jinzhao, Wang, Guoqing, Iida, Kazuki, Kamazawa, Kazuya, Park, Jitae T., Bourdarot, Frederic, Ren, Zhian, Li, Yuan |
| Rok vydání: |
2024 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| Popis: |
FeSe$_{1-x}$S$_{x}$ superconductors are commonly considered layered van der Waals materials with negligible inter-layer coupling. Here, using inelastic neutron scattering to study spin excitations in single-crystal samples, we reveal that the magnetic coupling between adjacent Fe layers is not only significant, as it affects excitations up to \textcolor{black}{15} meV, but also ferromagnetic in nature, making the system different from most unconventional superconductors including iron pnictides. Our observation provides a new standpoint to understand the absence of magnetic order in FeSe$_{1-x}$S$_{x}$. Since intercalating between the Fe layers is known to enhance superconductivity and suppress the inter-layer coupling, superconductivity appears to be a more robust phenomenon in the two-dimensional limit than antiferromagnetic order. |
| Databáze: |
arXiv |
| Externí odkaz: |
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