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Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain |
| Wang Zhong-Long(王忠龙)a)† and Fu Hua-Hua(傅华华)b) |
| a Science College, China Three Gorges University, Yichang 443002, China; b School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract The magnetic properties of an antiferromagnetic bond alternating spin-1/2 zigzag chain with asymmetrical ferromagnetic next-nearest-neighbour exchange interactions at finite temperature are investigated by using the many-body Green's function theory. It is found that the ferrimagnetic ordering does not appear in the symmetrical next-nearest-neighbour coupling case, and takes place only for the asymmetrical next-nearest-neighbour case at finite temperature rather than the ground state. Furthermore, as the asymmetry degree of the next-nearest-neighbour exchange interactions increases, the ferrimagnetism becomes more and more dominant. It is shown that the elementary excitation spectra are responsible for the observed magnetic behaviour.
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Received: 25 March 2011
Revised: 21 May 2011
Accepted manuscript online:
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PACS:
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75.50.Gg
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(Ferrimagnetics)
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75.30.Et
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(Exchange and superexchange interactions)
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75.10.Pq
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(Spin chain models)
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Cite this article:
Wang Zhong-Long(王忠龙) and Fu Hua-Hua(傅华华) Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain 2011 Chin. Phys. B 20 097502
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