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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Single-ion anisotropy effects on the demagnetization process of the alternating weak-rung interacting mixed spin-(1/2,1) Ising-Heisenberg double saw-tooth ladders
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Single-ion anisotropy effects on the demagnetization process of the alternating weak-rung interacting mixed spin-(1/2,1) Ising-Heisenberg double saw-tooth ladders

机译：单离子各向异性效应交替弱梯间相互作用混合旋转 - （1 / 2,1）均匀的双锯齿梯

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摘要

The entropy and cooling property of the mixed spin-(1/2, 1) Ising-Heisenberg double saw-tooth ladder are rigorously examined under an adiabatic demagnetization process using the classical transfer-matrix formalism. The model is characterized once by XXX and once by XX interactions between the interstitial Heisenberg dimers. An Ising-type coupling links spins localized on the legs and rungs. We investigate the ability of cooling/heating of the models nearby some typical critical points. It is evidenced that both models exhibit an enhanced magnetocaloric effect in a proximity of the magnetization steps and jumps. During an adiabatic demagnetization process, a sharp temperature drop is seen close to the first-order zero-temperature phase transitions. We conclude that the single-ion anisotropy considered for the integer spins plays an essential role to determine an efficiency of the magnetocaloric effect of the models under consideration.
机译：在绝热退磁过程中，利用经典传递矩阵方法，严格研究了混合自旋-（1/2，1）伊辛-海森堡双锯齿阶梯的熵和冷却特性。该模型的特征是间隙海森堡二聚体之间的XXX和XX相互作用。Ising型耦合连杆在腿和横档上旋转。我们研究了模型在一些典型临界点附近的冷却/加热能力。结果表明，两种模型在磁化阶跃附近都表现出增强的磁热效应。在绝热退磁过程中，在一阶零温相变附近可以看到急剧的温降。我们的结论是，考虑整数自旋的单离子各向异性对于确定所考虑模型的磁热效应的效率起着至关重要的作用。

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