The nature of low-temperature minimum of resistivity in ceramic manganites

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Electrical transport and magnetization measurements were carried out on a ceramic samples of La0.5Pb0.5MnO3 and La0.5Pb0.5MnO3 containing 10 at.% of Ag in a dispersed form. The resistivity (ρ) at zero applied magnetic field exhibits a shallow minimum at the temperature T ∼ 25÷30 K. This minimum shifts towards lower T upon applying a magnetic field (H) and disappears at a certain field Her, while residual resistivity decreases notably with increasing of H. It is found that the bulk-scattering model is not adequate for describing of such behavior of ρ in the presence of H. It seems that the proposed model of charge-carrier tunneling between antiferromagnetically coupled grains accounts for the results obtained.

Original languageEnglish
Pages (from-to)601-604
Number of pages4
JournalMaterials Science Forum
StatePublished - 1 Jan 2001
Event8th European Magnetic Materials and Applications Conference (EMMA 2000) - Kyiv, Ukraine
Duration: 7 Jun 200010 Jun 2000


  • Doped polycrystalline La-manganites
  • Magnetoresistance and resistivity at low temperatures

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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