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- W2021310273 abstract "Abstract The magnetic properties of the spinels CoAl 2 x Ga 2−2 x O 4 and ZnCr 2 x Ga 2−2 x O 4 systems in the range 0 ≤ x ≤ 1 have been studied by mean field theory and high-temperature series expansions. By using the first theory, we have evaluated the nearest neighbour and the next-neighbour super-exchange interaction J 1 ( x ) and J 2 ( x ), respectively, for the first systems in the range 0 ≤ x ≤ 1 and J 1 ( x = 1), J 2 ( x = 1) for the second system. The intra-planar and the inter-planar interactions are deduced. The corresponding classical exchange energy for magnetic structure is obtained for the first system. The second theory have been applied in the spinels CoAl 2 x Ga 2−2 x O 4 and ZnCr 2 x Ga 2−2 x O 4 systems, combined with the Pade approximants method, we have obtained the magnetic phase diagrams ( T N versus dilution x ) in the range 0 ≤ x ≤ 1. The obtained theoretical results are in agreement with experimental ones obtained by magnetic measurements and Mossbauer spectroscopy. The threshold percolation in the second system is x p ≈ 0.4. The critical exponents associated with the magnetic susceptibility ( γ ) and the correlation lengths ( ν ) are deduced in the range 0 ≤ x ≤ 1." @default.
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- W2021310273 date "2008-08-01" @default.
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- W2021310273 title "Magnetic phase diagrams of the spinels AB2xGa2−2xO4 (A=Zn, Co; B=Al, Cr) systems" @default.
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- W2021310273 doi "https://doi.org/10.1016/j.jallcom.2007.06.112" @default.
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