Exact eigenstates of highly frustrated spin lattices probed in high fields

Details Exact eigenstates of highly frustrated spin lattices probed in high fields Exact eigenstates of highly frustrated spin lattices probed in high fields

2006-06-15

arxiv.org/abs/cond-mat/0606401v2

J. Phys. Confer. Ser. 51 (2006) 43

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, submitted to the proceedings of the Yamada Conference LX on Research in High Magnetic Fields, August 16-19, 2006 Send

Scientific paper

10.1088/1742-6596/51/1/007

Strongly frustrated antiferromagnets such as the magnetic molecule {Mo72Fe30}, 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.

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