Magnetocaloric Effect in Anisotropic Mixed Spin1/2–1 System: Pair Approximation Method

作     者：Abderrazak Boubekri Moulay Youssef El Hafidi Mohamed El Hafidi 

作者机构：Laboratory of Condensed Matter Physics Faculty of Sciences Ben M’sik Hassan II University of Casablanca 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2019年第71卷第11期

页      面：1370-1378页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

主　　题：anisotropic Heisenberg model dilution entropy change mixed spin system inverse magnetocaloric effect pair approximation magnetic Gruneisen ratio 

摘      要：We use the Pair Approximation method to analyze the magnetic and magnetocaloric behaviors of diluted mixed spin SA=1 and spin SB=1/2 with the anisotropic Heisenberg model, on a cubic lattice with coordination number z=6. Our system is described in presence of an external magnetic field;the phase diagram and thermodynamic properties related to the concentration of magnetic atom(A or B) and the single ion anisotropy are constructed and *** attention is paid to magnetocaloric properties provided by isothermal entropy change as well as the cooling capacity. These cooling power keys are plotted and discussed as a function of interaction anisotropy and magnetic component concentration of two sublattices ions A and B. Numerical results show a double peak structure in the entropy change curve and the inverse magnetocaloric effect related to the presence of the negative single-ion anisotropy.