Effect of Co-Substitution on Magnetic Properties in Spinels GeNi2O4 Systems

被引：2
作者：
Masrour, R. [1 ]
Hamedoun, M. [1 ,2 ]
Benyoussef, A. [3 ]
Hourmatallah, A. [1 ,4 ]
Bouslykhane, K. [1 ]
Benzakour, N. [1 ]
机构：
[1] Univ Sidi Mohammed Ben Abdellah, Fac Sci, Lab Phys Solide, Fes, Morocco
[2] Expert Aupres Acad Hassan II Sci & Tech, Rabat, Morocco
[3] Univ Mohammed 5, Fac Sci, LMPHE, Rabat, Morocco
[4] Ecole Normale Super, Equipe Phys Solide, Bensouda, Fes, Morocco
来源：
CHINESE PHYSICS LETTERS | 2008年 / 25卷 / 11期
关键词：
D O I：
10.1088/0256-307X/25/11/076
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The magnetic properties of spinel GeNi(2-2x)Co(2x)O(4) systems in the range 0 <= x <= 1 are studied by mean field theory and high-temperature series expansions. The nearest neighbouring and the next-neighbouring super-exchange interactions J(1)(x) and J(2)(x) are evaluated for these systems in the range 0 <= x <= 1, by using the first theory. The intra-planar and the inter-planar interactions and the exchange energy are deduced. The second theory is applied in the spinel GeNi(2-2x)Co(2x)O(4) systems, combined with the Pade approximants method, to determine the magnetic phase diagrams (T(N) versus dilution x) in the range 0 <= x <= 1. The obtained theoretical results are in agreement with experimental data obtained by magnetic measurements. The critical exponents associated with the magnetic susceptibility gamma and the correlation lengths nu are deduced.
引用
收藏
页码：4117 / 4119
页数：3
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