2018/05/15 by Hamid Arian Zad, Zad, Hamid Arian, Vadim Ohanyan +1
Materials Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Statistical Mechanics (cond-mat.stat-mech)
paper · pdf · doi:10.48550/arxiv.1805.05607
openalex publication_date 2018/05/15 · openalex created_date 2018/06/01 · openalex updated_date 2026/07/28
The entropy and cooling rate of the both antiferromagnetic spin-1/2 double sawtooth IsingHeisenberg model and mixed-spin (1,1/2) double sawtooth Ising-Heisenberg model on the distorted ladders are rigorously investigated under an adiabatic demagnetization process using the quantum transfer-matrix technique. The models include the XXZ interaction between the interstitial Heisenberg dimers, the Ising coupling between nearest-neighbor spins of the legs and rungs, and additional cyclic four-spin exchange (ring exchange) in the square plaquette of each block. Close to field-induced quantum phase transitions, we compare both models together in the ability of cooling/heating near the quantum critical points. However, we observe a large magnetocaloric effect for both models, the mixed-spin double sawtooth ladder shows much more magneticaloric efficiency than the spin-1/2 double sawtooth ladder. During an adiabatic demagnetization process it can be seen a temperature dropping in the vicinity of the zero-temperature quantum phase transitions. Various fixed values of the Isotropic and anisotropic parameters explicitly alter the quality of the magnetocaloric effect. This properties suggest double sawtooth Ising-Heisenberg ladders as promising alternative refrigerant materials for low-temperature magnetic refrigeration.