Magnetic properties of spinels GeNi2-xCoxO4 systems: Green's function and high-temperature series expansions

被引：2
作者：
El Grini, A. [1 ]
Salmi, S. [1 ]
Masrour, R. [2 ]
Hamedoun, M. [3 ]
Bouslykhane, K. [1 ]
Marzouk, A. [4 ]
Hourmatallah, A. [4 ]
Benzakour, N. [1 ]
机构：
[1] Fac Sci Dhar El Mehraz Fes, Lab Phys Solide, Fes, Morocco
[2] Cadi Ayyed Univ, Natl Sch Appl Sci, Lab Mat Proc Environm & Qual, Safi, Morocco
[3] MAScIR, Inst Nanomat & Nanotechnol, Rabat, Morocco
[4] Ecole Normale Super, Equipe Phys Solide, Lab LIPI, Bensouda, Fes, Morocco
来源：
PHASE TRANSITIONS | 2018年 / 91卷 / 06期
关键词：
Spinels; Heisenberg model; Green's function; HTSE; random-phase approximation; REORIENTATION TRANSITION; ANISOTROPY; RESONANCE; WAVE;
D O I：
10.1080/01411594.2018.1453931
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The Green's function theory and high-temperature series expansions technical have been developed for magnetic systems GeNi2-xCoxO4. We have applied the Green's function theory to evaluate thermal magnetization and magnetic susceptibility for different values of magnetic field and dilution x, considering all components of the magnetization when an external magnetic field is applied in (x,z)-plane. The second theory combined with the Pade approximants method for a randomly diluted Heisenberg magnet is used to deduce the magnetic phase diagram of GeNi2-xCoxO4 systems. The critical exponents and associated with the magnetic susceptibility and the correlation length , respectively, have been deduced. The theoretical results are compared with those given by magnetic measurements.
引用
收藏
页码：619 / 630
页数：12
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