Semiclassical Model of Magnons in Double-Layered Antiferromagnets
| Autor: | Kim, Seo-Jin, Jirák, Zdeněk, Hejtmánek, Jiří, Knížek, Karel, Rosner, Helge, Ahn, Kyo-Hoon |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The stability of the double-layered antiferromagnets and their magnonic properties are investigated by considering two model systems, the linear chain (LC) and more complex chain of railroad trestle (RT) geometry, and a real example of chromium nitride CrN. The spin-paired order ($\cdots{+}{+}{-}{-}\cdots$) in LC requires an alternation of the ferromagnetic and antiferromagnetic (AFM) interactions, while analogous spin-paired order in RT can be stable even for all magnetic exchange interactions being AFM. The rock-salt structure of CrN evokes clear magnetic frustration since Cr atoms in face-centered cubic lattice form links to twelve nearest neighbors all equivalent and AFM. Nonetheless, the magnetostructural transition to an orthorhombically distorted phase below $T_\text{N} = 287~\text{K}$ leads to a diversification of Cr-Cr links, which suppresses the frustration and allows for stable double-layered AFM order of CrN. Based on $\textit{ab initio}$ calculated exchange parameters, the magnon spectra and temperature evolution of ordered magnetic moments are derived. Comment: 7 pages, 8 figures |
| Databáze: | arXiv |
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