We study numericaly and analytically a simple model for the magnetic properties of moderately impure (x≤0.2) Li1-xNi1+xO2 compounds. The model largely relies on available experimental results and it is investigated by complementary methods: percolation and Monte Carlo simulations, together with random-field analytical theory. Our results conclusively show a critical change of the magnetic response above a given concentration xc=0.11-0.14. We find that, beyond this concentration, the unusual features of the spontaneous magnetization observed experimentally result from the coexistence of ferrimagnetic long-range order with cluster superparamagnetism.
|Number of pages
|Physical Review B - Condensed Matter and Materials Physics
|Published - Sep 1 2001
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics