Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes

Lay Sheng Ewe, I. Hamadneh, H. Salama, Nasri A. Hamid, S. A. Halim, R. Abd-Shukor

Research output: Contribution to journalArticle

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Abstract

The magnetotransport and magnetoresistive (MR) properties of manganese-based La0.67Ca0.33MnO3 perovskite with different grain sizes are reported. The electrical resistivity was measured as a function of temperature in magnetic fields of 0.5 and 1 T. The insulator-metal transition temperature, T IM, shifted to a higher temperature with the application of the magnetic field. In zero field, T IM is almost constant (∼271 K) for all samples except for the sample with the largest grain size, where T IM=265 K. The temperature dependence of resistivity was fitted with several equations in the metallic (ferromagnetic) region and the insulating (paramagnetic) region. The density of states at the Fermi level, N(E F), and the activation energy of electron hopping were estimated by fitting the resistivity versus temperature curves. The ρ-T 2 curves are nearly linear in the metallic regime, but the ρ-T 2.5 curves exhibit a deviation from linearity. The variable range hopping model and small polaron hopping model fit the data well in the high-temperature region, indicating the existence of the Jahn-Teller distortion that localizes the charge carriers. MR was found to increase with an increase in the magnetic field, an effect which is attributed to the intergrain spin tunneling effect.

Original languageEnglish
Pages (from-to)457-463
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Volume95
Issue number2
DOIs
Publication statusPublished - 01 May 2009

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Galvanomagnetic effects
Temperature
Magnetic fields
Magnetic field effects
Jahn-Teller effect
Gene Conversion
Manganese
Fermi level
Charge carriers
Perovskite
Superconducting transition temperature
Activation energy
Electrons
Metals

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Ewe, Lay Sheng ; Hamadneh, I. ; Salama, H. ; A. Hamid, Nasri ; Halim, S. A. ; Abd-Shukor, R. / Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes. In: Applied Physics A: Materials Science and Processing. 2009 ; Vol. 95, No. 2. pp. 457-463.
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Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes. / Ewe, Lay Sheng; Hamadneh, I.; Salama, H.; A. Hamid, Nasri; Halim, S. A.; Abd-Shukor, R.

In: Applied Physics A: Materials Science and Processing, Vol. 95, No. 2, 01.05.2009, p. 457-463.

Research output: Contribution to journalArticle

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AB - The magnetotransport and magnetoresistive (MR) properties of manganese-based La0.67Ca0.33MnO3 perovskite with different grain sizes are reported. The electrical resistivity was measured as a function of temperature in magnetic fields of 0.5 and 1 T. The insulator-metal transition temperature, T IM, shifted to a higher temperature with the application of the magnetic field. In zero field, T IM is almost constant (∼271 K) for all samples except for the sample with the largest grain size, where T IM=265 K. The temperature dependence of resistivity was fitted with several equations in the metallic (ferromagnetic) region and the insulating (paramagnetic) region. The density of states at the Fermi level, N(E F), and the activation energy of electron hopping were estimated by fitting the resistivity versus temperature curves. The ρ-T 2 curves are nearly linear in the metallic regime, but the ρ-T 2.5 curves exhibit a deviation from linearity. The variable range hopping model and small polaron hopping model fit the data well in the high-temperature region, indicating the existence of the Jahn-Teller distortion that localizes the charge carriers. MR was found to increase with an increase in the magnetic field, an effect which is attributed to the intergrain spin tunneling effect.

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