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|Type:||Artigo de periódico|
|Title:||Weakly (x=0) and randomly (x=0.033) coupled Ising antiferromagnetic planes in (Li1-3xFex)NiPO4 compounds|
|Abstract:||Neutron diffraction and magnetic susceptibility studies of (Li1-3xFex)NiPO4 (x = 0 and x = 0.033) compounds reveal remarkable differences between the magnetic properties of pure LiNiPO4 and those of its lightly iron-doped derivative. The spin system associated with the Ni2+ ions (S = 1) in the pure compound undergoes a collinear antiferromagnetic ordering at T-N = 19.1 +/- 0.5 K, with the characteristics of weakly coupled two-dimensional (2D) Ising square planes. By contrast, randomly intercalated iron spins (in Li sites) between Ni2+ planes comprise a spin-glass-like subsystem which, despite their minute amount, drives the antiferromagnetic transition to higher temperatures T-N= 25.2 +/- 0.5 K; and significantly modifies the critical behavior of the 2D Ni2+ system. It is argued that the doped compound can serve as a model system for studying the randomly coupled planar Ising model.|
|Editor:||Amer Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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