Controlled frustration in the antiferromagnetic triangular lattice LiNi1-xCoxO2(0<or=x<or=1)

Publisher Website
Google Scholar
Abstract
In order to study the effects of frustration on the magnetic properties of the antiferromagnetic triangular lattice LiNi1-xCoxO2, the authors measured the temperature dependence of both the magnetization and the AC susceptibility. With a random substitution of non-magnetic Co ions for Ni ions, the characteristic temperatures TN1 ( approximately=240 K) and TN2( approximately=35 K) gradually shifted to higher and lower temperatures, respectively, and the magnetic moment per Ni ion was drastically enhanced between TN1 and TN2. The spin angular momentum of the Ni3+ ion, however remains at about 0.5, confirming the low-spin state over the whole range of concentrations. They also performed neutron-scattering experiments and found that the intensity of diffuse scattering in the forward directions at low temperatures decreases on substitution. A new model for the magnetic interactions in LiNiO2 is proposed on the basis of these results.

This publication has 22 references indexed in Scilit: