Metamagnetic Phase Transition of the Antiferromagnetic Heisenberg Icosahedron

作     者：Christian Schröder Heinz-Jürgen Schmidt Jürgen Schnack Marshall Luban 

作者机构：Department of Electrical Engineering and Computer Science University of Applied Sciences Bielefeld D-33602 Bielefeld Germany and Ames Laboratory Ames Iowa 50011 USA Universität Osnabrück Fachbereich Physik D-49069 Osnabrück Germany Ames Laboratory & Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2005年第94卷第20期

页      面：207203-207203页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Antiferromagnetic materials 

摘      要：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.