Electrical-transport studies on (La1-xPrx) 2/3Ba1/3MnO3 compounds

Huda Abdullah, S. A. Halim

Research output: Contribution to journalArticle

Abstract

The magnetic and transport properties of (La1-xPrx) 2/3Ba1/3MnO3(x = 0, 0.1677,0.333,0.500, 0.677, 0.833, 1.000) compounds, prepared by the solid state reaction have been investigated. The metal-insulator transition (Tp) was determined by using the standard four-point probe resistivity measurement between of 30 and 300 K. With increasing Pr doping, Tp shifted to lower temperatures, which are greater than 300, 270, 250,226,202, 186 and 158 K for x = 0, 0.1677, 0.333, 0.500, 0.677, 0.833 and 1.000, respectively. By analyzing the data using several theoretical models, it was concluded that the metallic (ferromagnetic) part of the resistivity (ρ), (below Tp), fits well with the equation ρ = ρ0 + ρ2T2 This indicates that ρ0 is due to the grain/domain boundary effects. The second term ~ρ2T2 appears to be attributed to electron-electron scattering. In the high temperature range (T>Tp) (the paramagnetic insulating regime) adiabatic small polaron models fit well in different temperature regions, thereby indicating that polaron hopping might be responsible for the conduction mechanism. The activation energy (Ea) also increases as the doping concentration increases.

Original languageEnglish
Pages (from-to)4428-4433
Number of pages6
JournalJournal of Applied Sciences
Volume8
Issue number23
DOIs
Publication statusPublished - 2008

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electrical resistivity
electron scattering
transport properties
insulators
activation energy
magnetic properties
solid state
conduction
probes
metals
electrons
temperature

Keywords

  • Activation energy (E)
  • Metal-insulator transition temperature (T)
  • Polaron

ASJC Scopus subject areas

  • General

Cite this

Electrical-transport studies on (La1-xPrx) 2/3Ba1/3MnO3 compounds. / Abdullah, Huda; Halim, S. A.

In: Journal of Applied Sciences, Vol. 8, No. 23, 2008, p. 4428-4433.

Research output: Contribution to journalArticle

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