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