Exact eigenstates of highly frustrated spin lattices probed in high fields
Autor(en): | Schnack, J. Schmidt, H.-J. Honecker, A. Schulenburg, J. Richter, J. |
Erscheinungsdatum: | 2006 | Herausgeber: | Institute of Physics Publishing | Journal: | Journal of Physics: Conference Series | Volumen: | 51 | Ausgabe: | 1 | Startseite: | 43 | Seitenende: | 46 | Zusammenfassung: | Strongly frustrated antiferromagnets such as the magnetic molecule Mo 72Fe30, the kagome, or the pyrochlore lattice exhibit a variety of fascinating properties like low-lying singlets, magnetization plateaus as well as magnetization jumps. During recent years exact many-body eigenstates could be constructed for several of these spin systems. These states become ground states in high magnetic fields, and they also lead to exotic behavior. A key concept to an understanding of these properties is provided by independent localized magnons. The energy eigenvalue of these n-magnon states scales linearly with the number n of independent magnons and thus with the total magnetic quantum number M Ns - n. In an applied field this results in a giant magnetization jump which constitutes a new macroscopic quantum effect. It will be demonstrated that this behavior is accompanied by a massive degeneracy, an extensive (T 0)-entropy, and thus a large magnetocaloric effect at the saturation field. The connection to flat band ferromagnetism will be outlined. © 2006 IOP Publishing Ltd. |
ISSN: | 17426588 | DOI: | 10.1088/1742-6596/51/1/007 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947637657&doi=10.1088%2f1742-6596%2f51%2f1%2f007&partnerID=40&md5=e4425137988a43949a8b4125ff666456 |
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geprüft am 23.05.2024