ABSTRACT

Many-body Green’s function and mean-field theories have been developed for magnetic systems Co_xZn_1−xCr₂O₄. We apply these theories to evaluate the thermal magnetization and magnetic susceptibility for different values of magnetic field and dilution x, by considering all components of the magnetization when an external magnetic field is applied in (x-z) plane. The critical temperature of Co_xZn_1−xCr₂O₄ spinels have been calculated in the range 0 ≤ x ≤ 1. The Green’s function results are compared with the results of high-temperature series expansion technique and experimental magnetic measurements.

中文翻译：

---

尖晶石 CoxZn1−xCr2O4 系统的磁性：格林函数、高温级数膨胀技术和平均场理论

摘要

多体格林函数和平均场理论已被开发用于磁性系统 Co _x Zn _{1− x} Cr ₂ O ₄。我们应用这些理论来评估不同磁场值和稀释度x的热磁化强度和磁化率，通过考虑在 ( x - z ) 平面施加外部磁场时磁化强度的所有分量。Co _x Zn _{1− x} Cr ₂ O ₄尖晶石的临界温度计算范围为 0 ≤  x ≤ 1. 将格林函数结果与高温级数膨胀技术和实验磁测量的结果进行比较。