Electrical and magneto-transport properties of La 0.8Sr 0.2MnO 3

S. T. Shilan, L. S. Ewe, Roslan Abd. Shukor

Research output: Contribution to journalArticle

Abstract

The effects of sintering temperature on the electrical and magneto-transport properties of La 0.8Sr 0.2 MnO 3 compounds prepared by employing a chemical co-precipitation route sintered at 1120°C, 1220°C and 1320°C are reported. The X-ray powder diffraction patterns for all samples can be indexed to the rhombohedra structure with R3C space group. The insulator-metal transition temperature remained nearly constant (291 K) for all samples. The magneto resistance (MR) values were found to decrease noticeably as the sintering temperature was increased from 1120°C to 1320°C. Above 0.3 T, the magneto resistance was influenced by T o values, which indicates the bending of Mn-O-Mn bond. The resistivity data were fitted with several equations in the metallic (ferromagnetic) region. In the insulating (paramagnetic) region, the variable range hopping and small polaron hopping models were used to compute the density of states at the Fermi level, N(E F), and activation energy (E a) of the electrons. The resistivities can be fitted well with ρ-T 2 and ρ-T 2.5 curves. The variable range hopping model and small polaron hopping model fitted very well at high temperature regions, indicating that small polaron hopping might be responsible for the conduction. La 0.8 Sr 0.2MnO 3 sintered at 1220°C demonstrated the highest MR of 6.5% in 1 T magnetic field.

Original languageEnglish
Pages (from-to)3825-3833
Number of pages9
JournalInternational Journal of Modern Physics B
Volume25
Issue number28
DOIs
Publication statusPublished - 10 Nov 2011

Fingerprint

transport properties
sintering
electrical resistivity
diffraction patterns
transition temperature
routes
insulators
activation energy
conduction
temperature
curves
magnetic fields
metals
electrons
x rays

Keywords

  • grain size
  • magneto transport
  • manganites
  • Metal-insulator transition temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Statistical and Nonlinear Physics

Cite this

Electrical and magneto-transport properties of La 0.8Sr 0.2MnO 3 . / Shilan, S. T.; Ewe, L. S.; Abd. Shukor, Roslan.

In: International Journal of Modern Physics B, Vol. 25, No. 28, 10.11.2011, p. 3825-3833.

Research output: Contribution to journalArticle

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