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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
Author: Vaknin, D
Zarestky, JL
Ostenson, JE
Chakoumakos, BC
Goni, A
Pagliuso, PJ
Rojo, T
Barberis, GE
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.
Country: EUA
Editor: Amer Physical Soc
Citation: Physical Review B. Amer Physical Soc, v. 60, n. 2, n. 1100, n. 1110, 1999.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.60.1100
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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