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Abstract
The effect of nonmagnetic Mg 2 + doping in SrNi 2 V 2 O 8 , a Haldane gap system with a disordered ground state, was investigated using DC magnetic susceptibility and heat capacity measurements in polycrystalline samples of SrNi 2 - x Mg x V 2 O 8 with x = 0.03 , 0.05, 0.07, 0.1 and 0.14. The results clearly reveal that the substitution of Ni 2 + ( S = 1 ) ion by Mg 2 + ( S = 0 ) ion induces a magnetic phase transition with the ordering temperatures lying in the range 3.4–4.3 K, for the samples with lowest and highest value of x. The intrachain exchange constant ( J / k B ) and the Haldane gap ( Δ ) for all the compounds were estimated to be ∼ 98 ± 2 and 25 K, respectively, which are close to that of the undoped compound. The magnetization data further suggest that the compounds exhibit metamagnetic behavior below T N , supporting a picture of antiferromagnet with significant magnetic anisotropy and competing intrachain and interchain interactions.
Published Version
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