Electrical and magneto-transport properties of magneto-resistive La 0.7Ca 0.28Sr 0.2MnO 3 prepared at different sintering temperature

Lay Sheng Ewe, R. Ramli, K. P. Lim, R. Abd-Shukor

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2 Citations (Scopus)

Abstract

The effects of strontium doping on the electrical and magneto-transport properties of magneto resistive La 0.7Ca 0.28Sr0.02MnO 3 at different sintering temperatures have been studied. The samples were prepared by the co-precipitation technique (COP) and sintered at 1120, 1220 and 1320 oC. XRD patterns revealed that the samples have an orthorhombic structure and the diffraction patterns can be indexed with the Pbnm space group. The insulator metal transition, TIM increased linearly from 261 K to 272 K with the increase in sintering temperature. The magnetoresistance (MR) measurements were made in magnetic fields from 0.1 to 1 T at room temperature. The percentage of MR increased with increasing of magnetic field and sintering temperature for all samples. The electrical resistivity data were fitted with several equations in the metallic (ferromagnetic) and insulator (paramagnetic) regime. The density of states at the Fermi level N(EF) and the activation energy (Ea) of electron hopping were estimated by using variable range hopping and small polaron hopping model. Copyright Reserved

Original languageEnglish
Pages (from-to)761-768
Number of pages8
JournalSains Malaysiana
Volume41
Issue number6
Publication statusPublished - Jun 2012

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sintering
transport properties
insulators
magnetic fields
strontium
temperature
diffraction patterns
transition metals
activation energy
electrical resistivity
room temperature
electrons

All Science Journal Classification (ASJC) codes

  • General

Cite this

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title = "Electrical and magneto-transport properties of magneto-resistive La 0.7Ca 0.28Sr 0.2MnO 3 prepared at different sintering temperature",
abstract = "The effects of strontium doping on the electrical and magneto-transport properties of magneto resistive La 0.7Ca 0.28Sr0.02MnO 3 at different sintering temperatures have been studied. The samples were prepared by the co-precipitation technique (COP) and sintered at 1120, 1220 and 1320 oC. XRD patterns revealed that the samples have an orthorhombic structure and the diffraction patterns can be indexed with the Pbnm space group. The insulator metal transition, TIM increased linearly from 261 K to 272 K with the increase in sintering temperature. The magnetoresistance (MR) measurements were made in magnetic fields from 0.1 to 1 T at room temperature. The percentage of MR increased with increasing of magnetic field and sintering temperature for all samples. The electrical resistivity data were fitted with several equations in the metallic (ferromagnetic) and insulator (paramagnetic) regime. The density of states at the Fermi level N(EF) and the activation energy (Ea) of electron hopping were estimated by using variable range hopping and small polaron hopping model. Copyright Reserved",
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Electrical and magneto-transport properties of magneto-resistive La 0.7Ca 0.28Sr 0.2MnO 3 prepared at different sintering temperature. / Ewe, Lay Sheng; Ramli, R.; Lim, K. P.; Abd-Shukor, R.

In: Sains Malaysiana, Vol. 41, No. 6, 06.2012, p. 761-768.

Research output: Contribution to journalArticle

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