Pressure-induced suppression of ferromagnetic phase in LaCoO3 nanoparticles

I. Fita, D. Mogilyansky, V. Markovich, R. Puzniak, A. Wisniewski, L. Titelman, L. Vradman, M. Herskowitz, V. N. Varyukhin, G. Gorodetsky

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Magnetic and structural properties of nanocrystalline LaCoO3 with particle size ranging from 25 to 38 nm, prepared by the citrate method, were investigated. All nanoparticles exhibit ferromagnetism below TC ≈ 85 K. It was found that the unit-cell volume increases monotonically with decreasing particle size and ferromagnetic (FM) moment increases simultaneously with lattice expansion, whereas TC remains nearly unchanged. It appears that both magnetic and structural properties of LaCoO3 nanoparticles are size-dependent due to the surface effect. On the other hand, an applied pressure suppresses strongly the FM phase leading to its disappearance at ∼11 kbar. Remarkably, the TC does not change visibly under pressure. Our data reveal that the ferromagnetism in LaCoO3 nanoparticles, likely related to the intermediate-spin (IS) Co3+ state, is simply controlled by the unit-cell volume. Within this scenario, the FM coupled IS states appear/disappear with expanding/compressing the lattice and/or Co-O bonds.

Original languageEnglish
Pages (from-to)5204-5206
Number of pages3
JournalJournal of Non-Crystalline Solids
Issue number47-51
StatePublished - 1 Dec 2008


  • Magnetic properties
  • Nanoparticles
  • Pressure effects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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