Metamagnetic phase transition of the antiferromagnetic Heisenberg icosahedron |
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Authors: | Schröder Christian Schmidt Heinz-Jürgen Schnack Jürgen Luban Marshall |
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Affiliation: | Department of Electrical Engineering and Computer Science, University of Applied Sciences Bielefeld, D-33602 Bielefeld, Germany. schroder@ameslab.gov |
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Abstract: | The observation of hysteresis effects in single molecule magnets like Mn12-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 Bc 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. |
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