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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
Physica Scripta ( IF 2.9 ) Pub Date : 2020-08-06 , DOI: 10.1088/1402-4896/aba663
Hamid Arian Zad 1, 2 , Nerses Ananikian 1, 3, 4 , Michal Jaščur 5
Affiliation  

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.

中文翻译:

单离子各向异性对交替弱阶相互作用混合自旋(1/2,1)Ising-Heisenberg双锯齿梯子退磁过程的影响

在绝热消磁过程中,使用经典的传递矩阵形式,对混合自旋(1/2,1)Ising-Heisenberg双锯齿阶梯的熵和冷却性能进行了严格检验。该模型的特征是一次XXX,一次是通过间质Heisenberg二聚体之间的XX相互作用。Ising型联轴节链接在腿和横档上的局部旋转。我们研究了一些典型临界点附近的模型的冷却/加热能力。有证据表明,两个模型在磁化阶跃和跃迁附近都表现出增强的磁热效应。在绝热退磁过程中,靠近一阶零温度相变时会看到急剧的温度下降。
更新日期:2020-08-10
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