论文标题
定义各向异性量子磁铁中从BEC到正常相的交叉的临界温度
Defining a critical temperature of a crossover from BEC to the normal phase in anisotropic quantum magnets
论文作者
论文摘要
我们解决了从Bose-Einstein凝结（BEC）相位到正常阶段的交叉中临界温度的问题。为此，我们研究了由Triplon的BEC描述的自旋胶质量子磁体的磁化的温度依赖性。我们已经使用Hartree-Fock-Bogouliubov近似近似近似稳定的量子磁铁计算了恒定场上的热容量$ C_H $，并发现了Triplon气体的Hamiltonian的优化参数。 在相变的区域，由于Dzyaloshinsky-Moriya（DM）相互作用，热容量$ C_H $被涂抹。磁化强度中波动的急剧最大被确定为交叉的临界温度。
We address the problem of identifying the critical temperature in a crossover from the Bose-Einstein condensed (BEC) phase to the normal phase. For this purpose we study the temperature dependence of magnetization of spin-gapped quantum magnets described by BEC of triplons. We have calculated the heat capacity $C_H$ at constant field and fluctuations in magnetization in a spin-gapped quantum magnet using the Hartree-Fock-Bogouliubov approximation and found optimized parameters of the Hamiltonian of triplon gas. In the region of phase transition, the heat capacity $C_H$ is smeared out due to the Dzyaloshinsky-Moriya (DM) interaction. The sharp maximum of the fluctuations in the magnetization is identified as the critical temperature of the crossover.
