论文标题
横向晶体中自旋-3/2量子铁磁性蓝光模型的相图：平均场水平的近似值
Phase diagram for the spin-3/2 quantum ferromagnetic Blume-Capel model in a transverse crystal field: an approximation at the mean-field level
论文作者
论文摘要
我们使用标准的bogoliubov不平等框架内的标准均值场近似值研究了横向晶体场中旋转$ 3/2 $铁磁蓝色绑带模型的相图。我们用一阶和二阶过渡线绘制一个非常丰富的相图；三智力和四智度点；订单2和双关键端点的关键终点。此外，还分析了磁化程度与温度的函数在纵向和横向晶体的广泛值中的函数。据我们所知，这种量子自旋模型仅采用有效的田间理论进行了研究，这反过来又无法完全表征其相图中的多政治现象，因为该过程不是基于自由能。因此，我们在本模型的相图上的发现是新颖的，因为它们先前没有报道。
We investigate the phase diagram for the spin-$3/2$ ferromagnetic Blume-Capel model in a transverse crystal field using the standard mean-field approximation within the framework of Bogoliubov inequality for free energy. We draw a very rich phase diagram with first- and second-order transition lines; tricritical and tetracritical points; critical endpoint of order 2 and double critical endpoint. Additionally, the behaviour of magnetisation as a function of temperature over a wide range of values of both longitudinal and transverse crystal fields is also analysed. To the best of our knowledge, this quantum spin model has only been studied employing an effective field theory, which in turn was not able to characterise completely the multicritical phenomena in its phase diagram, because that procedure is not based on free energy. Thus, our findings on the phase diagram for the present model are novel as they have been not previously reported.
