Dyson–Maleev theory of an X X Z ferrimagnetic spin chain with single-ion anisotropy Project supported by the National Natural Science Foundation of China (Grant No. 10774035) and the Qianjiang RenCai Program of Zhejiang Province, China (Grant No. 2007R0010). |
(color online) Energy spectrums with different XXZ anisotropic parameters λ = 1.0 (red solid), λ = 1.1 (black dotdashed), λ = 1.2 (green dashed) and λ = 1.3 (blue dotted) at zero temperature. |