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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Abstract

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
Volume322
Issue number9-12
DOIs
StatePublished - 1 May 2010

Keywords

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

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