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 m...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-nearestneighbour 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.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.1010804034)the Science Foundation of China for Three Gorges University (Grant No.KJ2009B012)
文摘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-nearestneighbour 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.
