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Metamagnetic phase transition of the antiferromagnetic Heisenberg icosahedron | | Christian Schröder
; Heinz-Jürgen Schmidt
; Jürgen Schnack
; Marshall Luban
; | | Date: |
24 Dec 2004 | | Subject: | Materials Science | cond-mat.mtrl-sci | | Abstract: | 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 $Bcrit$ 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. | | Source: | arXiv, cond-mat/0501558 | | Services: | Forum | Review | PDF | Favorites | |
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