Frustration-Induced Ferrimagnetism in S = 1/2 Heisenberg Spin Chain
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概要
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The ground-state properties of the S = 1/2 frustrated Heisenberg spin chain with interactions up to fourth nearest neighbors are investigated by the exact-diagonalization method and density matrix renormalization group method. Our numerical calculations clarify that the ferrimagnetic state is realized in the ground state in spite of the fact that a multi-sublattice structure in the shape of the system is absent. We find that there are two types of ferrimagnetic phases: one is the well-known ferrimagnetic phase of the Lieb--Mattis type and the other is the nontrivial ferrimagnetic phase that is different from that of the Lieb--Mattis type. Our results suggest that a multi-sublattice structure of the shape is not necessarily required for the occurrence of ferrimagnetism.
- 2011-04-15
著者
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Nakano Hiroki
Graduate School And Faculty Of Science Himeji Institute Of Technology
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Shimokawa Tokuro
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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