Application of the high temperature series expansions method Green's function theory to the spinel systems: AxA'1-xB2X4

7th Maghreb Days of Material Sciences

El Grini, A.^1 ; Salmi, S.^1 ; Marzouk, A.^2 ; Benzakour, N.^1 ; Bouslykhane, K.^1 ; Hourmatallah, A.^2

Laboratoire de Physique du Solide-USMBA-FSDM-Fès, France^1

Equipe de Physique du Solide-USMBA-ENS, France^2

关键词: Correlation lengths;    Critical exponent;    Cu-Ferrite;    Heisenberg models;    High-temperature series expansion;    Many body;    Mn concentrations;    Spinel system;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/186/1/012004/pdf
DOI  :  10.1088/1757-899X/186/1/012004

来源: IOP

【 摘 要 】

The magnetic properties of Mn-Cu ferrites MnxCu1-xFe2O4, have been studied using the many-body Green's function theory (GFT) and high temperature series expansion theory (HTSE). The thermal magnetization and the magnetic susceptibility are given for different values of magnetic field and dilution x. The transition temperature TCis calculated as a function of Mn concentration. The obtained results are in good agreement with experimental results. The critical exponents associated with the magnetic susceptibility (γ) and the correlation lengths (ν) have been deduced. The obtained values are comparable to those of 3D Heisenberg model.