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Effect of Co-Substitution on Magnetic Properties in Spinels GeNi2O4 Systems |
| R. Masrour1, M. Hamedoun1,2, A. Benyoussef3,4, A. Hourmatallah1,5, K. Bouslykhane1, N. Benzakour1 |
| 1Laboratoire de Physique du Solide, Université Sidi Mohammed Ben Abdellah, Faculté des sciences, BP 1796, Fes, Morocco2Expert Auprés de l'Académie Hassan II des Sciences et Techniques, Rabat, Morocco3LMPHE, Faculté des Sciences, Université Mohamed V, Rabat, Morocco4Member of the Hassan II Academy of Sciences and Technology, Rabat, Morocco5Equipe de Physique du Solide, Ecole Normale Supérieure, BP 5206, Bensouda, Fes, Morocco |
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| Cite this article: |
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R. Masrour, M. Hamedoun, A. Benyoussef et al 2008 Chin. Phys. Lett. 25 4117-4119 |
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Abstract The magnetic properties of spinel GeNi2-2xCo2xO4 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 J1 (x) and J2(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 GeNi2-2xCo2xO4 systems, combined with the Padé approximants method, to determine the magnetic phase diagrams (TN 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 γ and the correlation lengths ν are deduced.
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75.10.Hk
75.10.Nr
75.25.+z
75.30.Et
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Received: 05 March 2008
Published: 25 October 2008
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