Frustration-Induced Ferrimagnetism in S=1/2 Heisenberg Spin Chain

Details Frustration-Induced Ferrimagnetism in S=1/2 Heisenberg Spin Chain Frustration-Induced Ferrimagnetism in S=1/2 Heisenberg Spin Chain

2011-02-22

arxiv.org/abs/1102.4414v1

J. Phys. Soc. Jpn. 80 (2011) 043703

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, to be published in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.80.043703

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.

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