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

被引：1

作者：

Wang Zhong-Long ^{[1
]}

Fu Hua-Hua ^{[2
]}

机构：

[1] China Three Gorges Univ, Coll Sci, Yichang 443002, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

来源：

CHINESE PHYSICS B | 2011年 / 20卷 / 09期

基金：

中国国家自然科学基金;

关键词：

ferrimagnetism; Green's function theory; zigzag spin chain; ELEMENTARY EXCITATIONS; MAGNETIC-PROPERTIES; HEISENBERG;

D O I：

10.1088/1674-1056/20/9/097502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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.

引用

页数：7

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