Coexistence of ferrimagnetic long-range order and cluster superparamagnetism in Li1-xNi1+xO2

D. Mertz, F. Celestini, B. E. Vugmeister, H. Rabitz, J. M. Debierre

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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.

Original languageEnglish (US)
Article number094437
Pages (from-to)944371-944378
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
StatePublished - Sep 1 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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