Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain

doi:10.1088/1674-1056/20/9/097502

中国物理B ›› 2011, Vol. 20 ›› Issue (9): 97502-097502.doi: 10.1088/1674-1056/20/9/097502

Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain

傅华华¹, 王忠龙²

(1)School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China; (2)Science College, China Three Gorges University, Yichang 443002, China

收稿日期:2011-03-25 修回日期:2011-05-21 出版日期:2011-09-15 发布日期:2011-09-15

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

Received:2011-03-25 Revised:2011-05-21 Online:2011-09-15 Published:2011-09-15

摘要/Abstract

摘要： 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.

关键词: ferrimagnetism, Green's function theory, zigzag spin chain

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.

Key words: ferrimagnetism, Green's function theory, zigzag spin chain

中图分类号: (Ferrimagnetics)

75.50.Gg

75.30.Et (Exchange and superexchange interactions) 75.10.Pq (Spin chain models)

王忠龙, 傅华华. Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain[J]. 中国物理B, 2011, 20(9): 97502-097502.

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[J]. Chin. Phys. B, 2011, 20(9): 97502-097502.

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Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain

Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain

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