%0 Journal Article
%T Ferrimagnetism induced by asymmetrical ferromagnetic next-nearest-neighbour exchange interactions in an antiferromagnetic spin-1/2 zigzag chain<br>
%A Wang Zhong-Long
%A Fu Hua-Hua
%A <br>
%J 中国物理 B
%D 2011
%I 
%X 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.
%K ferrimagnetism
%K Green's function theory
%K zigzag spin chain<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=49438F68A18A4524B7B8651202009BBC&yid=9377ED8094509821&vid=A04140E723CB732E&iid=9CF7A0430CBB2DFD&sid=390A0A922F0CB734&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=28