Metamagnetic phase transition of the antiferromagnetic Heisenberg icosahedron
Autor(en): | Schroder, C Schmidt, HJ Schnack, J Luban, M |
Stichwörter: | MAGNETS; Physics; Physics, Multidisciplinary; SIMULATIONS | Erscheinungsdatum: | 2005 | Herausgeber: | AMERICAN PHYSICAL SOC | Journal: | PHYSICAL REVIEW LETTERS | Volumen: | 94 | Ausgabe: | 20 | Zusammenfassung: | The observation of hysteresis effects in single molecule magnets like Mn-12-acetate has initiated ideas of future applications in storage technology. The appearance of a hysteresis loop in such compounds is an outcome of their magnetic anisotropy. In this Letter we report that magnetic hysteresis occurs in a spin system without any anisotropy, specifically where spins mounted on the vertices of an icosahedron are coupled by antiferromagnetic isotropic nearest-neighbor Heisenberg interaction giving rise to geometric frustration. At T=0 this system undergoes a first-order metamagnetic phase transition at a critical field B-c between two distinct families of ground state configurations. The metastable phase of the system is characterized by a temperature and field dependent survival probability distribution. |
ISSN: | 00319007 | DOI: | 10.1103/PhysRevLett.94.207203 |
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geprüft am 20.05.2024