Magnetotransport properties of ferromagnetic LaMnO3+δ nano-sized crystals

V. Markovich, G. Jung, I. Fita, D. Mogilyansky, X. Wu, A. Wisniewski, R. Puzniak, L. Titelman, L. Vradman, M. Herskowitz, G. Gorodetsky

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Transport and magnetic properties of LaMnO3+δ nanoparticles with average size of 18 nm have been investigated. The ensemble of nanoparticles exhibits a paramagnetic to ferromagnetic (FM) transition at TC∼246 K, while the spontaneous magnetization disappears at T≈270 K. It was found that the blocking temperature lies slightly below TC. The temperature dependence of the resistivity shows a metal–insulator transition at T≈192 K and low-temperature upturn at T<50 K. The transport at low temperatures is controlled by the charging energy and spin-dependent tunnelling through grain boundaries. The low temperature I–V characteristics are well described by indirect tunnelling model while at higher temperatures both direct and resonant tunnelling dominates.
Original languageEnglish
Pages (from-to)1311-1314
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Issue number9-12
Publication statusPublished - May 2010


  • Manganite
  • Nanoparticle
  • Resistivity
  • Tunnelling
  • Magnetization
  • Curie temperature

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