在外磁场中两链自旋梯子模型的自旋波与比热  

The Spin-waves and Specific Heat for Two-chain Ladderin an External Magnetic Field

作　　者：赵新军[1] 郭秀珍[1] 尹红梅[1] 

机构地区：[1]伊犁师范学院物理与电子信息学院,新疆伊宁835000

出　　处：《伊犁师范学院学报（自然科学版）》2009年第1期20-24,共5页Journal of Yili Normal University：Natural Science Edition

摘　　要：应用Jordan-Wigner变换和格林函数方法讨论了在外磁场中带有阻挫的两链自旋梯子模型的自旋波、子晶格磁矩、内能及比热,获得了比热与温度、外磁场的关系.结果显示:自旋波与波矢k成余弦关系,与外磁场成线性关系;当温度T趋近于0.5K和0.42K时,比热有明显的跃变.We discussed the spin-waves, sublattice magnetic moments, internal energy and specific heat for two-chain ladder model in an external magnetic field. We showed the temperature and external magnetic field dependence of spin-waves and specific heat. We find the spin-waves have a linear dependence on the external magnetic field, and sublattice magnetic moments and specific heat are exponential functions of temperature and the external magnetic field. We also found, with increasing of temperature, the specific heat has a sharp peak when T ≈ 0.5K and T ≈0.42K.

关 键 词：自旋梯子模型 JORDAN-WIGNER变换 格林函数 自旋波 比热 

分 类 号：O469[理学—凝聚态物理]