论文标题
spin-1/2 $ xxz $ heisenberg cholae：磁化过程和相关增强的磁化效果
Spin-1/2 $XXZ$ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect
论文作者
论文摘要
磁化曲线和磁电效应在抗铁磁磁磁性的灭绝磁化效果中，使用确切的数值二轴向的值，并全面研究了与确切的数值二日利组合的值，并全面研究了具有约翰逊固体形状（三角形冲天盘，方形冲天盘和五角星的三角形冲天盘和五角星的形状）的形状（三角形冲天盘和五角星）的形状。各向同性极限。证明Spin-1/2 $ XXZ $ HEISENBERG CUCLOAE显示器与他们的Ising同行相比，至少还有一个磁化高原。新型的磁化高原延伸到更广泛的磁场范围内，并增加了$ xxz $交换耦合的量子部分，而限制了限制情况下的原始高原。结果表明，Spin-1/2 $ XXZ $ HEISENBERG三角形和五角形毒震在零磁场附近表现出增强的磁化效应，这使这些磁性系统有望冷却至超低零温度。
The magnetization curves and magnetocaloric effect during the adiabatic demagnetization of antiferromagnetic spin-1/2 $XXZ$ Heisenberg clusters with the shape of Johnson's solids (triangular cupola, square cupola and pentagonal cupola) are investigated using the exact numerical diagonalization for different values of the exchange anisotropy ranging in between the Ising and fully isotropic limit. It is demonstrated that spin-1/2 $XXZ$ Heisenberg cupolae display, in comparison with their Ising counterparts, at least one more magnetization plateau. The novel magnetization plateaux extends over a wider range of the magnetic fields with increasing of a quantum part of the $XXZ$ exchange coupling at the expense of the original plateaux present in the limiting Ising case. It is shown that the spin-1/2 $XXZ$ Heisenberg triangular and pentagonal cupolae exhibit an enhanced magnetocaloric effect in the vicinity of zero magnetic field, which makes these magnetic systems promising refrigerants for cooling down to ultra-low zero temperatures.
