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
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
摘要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.
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.
R. Masrour;M. Hamedoun;A. Benyoussef;A. Hourmatallah;K. Bouslykhane;N. Benzakour. Effect of Co-Substitution on Magnetic Properties in Spinels GeNi2O4 Systems[J]. 中国物理快报, 2008, 25(11): 4117-4119.
R. Masrour, M. Hamedoun, A. Benyoussef, A. Hourmatallah, K. Bouslykhane, N. Benzakour. Effect of Co-Substitution on Magnetic Properties in Spinels GeNi2O4 Systems. Chin. Phys. Lett., 2008, 25(11): 4117-4119.
[1] Crawford M K et al 2003 Phys. Rev. B 68 220408R [2] Lancaster T, Blundell S J, Prabhakaran D and Hayes W 2005 Preprint cond-mat/0504139 v1 [3] Hara S, Yoshida Y, Ikeda S I, Shirakawa N, Crawford K A, Takase K, Takano Y and Sekizawa K 2004 J. Phys Soc. Jpn. 73 2959 [4] Schiessl W, Potzel W, Karzel H, Steiner M, Kalvius G M, Martin A, Karuse M K, Halevy I, Gal J, Schafer W, Will G, Hillberg M and Wappling R 1996 Phys. Rev. B 53 9413 [5] Zhou H D, Kiss A, Janik J A and Wiebe C R 2007 J. Phys.: Condens. Matter 19 156202 [6] Hamedoun M, Houssa M, Benzakour N and Hourmatallah A 1998 J. Phys.: Condens. Mater. 10 3611 [7] Hamedoun M, Houssa M, Benzakour N and Hourmatallah A 1999 Physica B 270 384 [8] Hamedoun M, Masrour R, Bouslykhane K, Hourmatallah A and Benzakour N 2007 Chin. Phys. Lett. 24 27 [9] Baker G A and Graves-Morris P 1981 Pad\'{e Approximants (London: Addison-Wesley) [10] Navaro R 1990 Magnetic Properties of Layered Transition Metal Compounds ed de Jonsgh L J (Daventa: Kluwer) p 105 [11] Moron M C 1986 J. Phys: Condens. Mater. 8 11141 [12] Hamedoun M, Wiedenmann A, Dormann J L, Nogues M and Rossat-Mignod J 1986 J. Phys. C: Solid State Phys. 19 1783 [13] Benzakour N, Hamedoun M, Houssa M, Hourmatallah A and Mahjoubi F 1999 Phys. Status Solidi B 212 335 [14] Alba M, Hammann J and Nougues M 1982 J. Phys. C 15 5441 [15] Afif K, Benyoussef A, Hamedoun M and Hourmatallah A 2000 Phys. Status Solidi B 219 383 [16] Hamedoun M, Masrour R, Bouslykhane K, Hourmatallah A and Benzakour N 2006 Phys. Status Solidi C 3 3307 [17] Hamedoun M, Masrour R, Bouslykhane K, Talbi F, Hourmatallah A and Benzakour N M 2007 J. Condens. Mater. 8 1 [18] Baker G A J, Nickel B G and Meiron D I 1978 Phys. Rev. B 17 1365 [19] George M J and Rehr J J 1984 Phys. Rev. Lett. 53 2063
2008, Vol. 25 
