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

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

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,...

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Main Authors: Ewe, L.S., Hamadneh, I., Salama, H., Hamid, N.A., Halim, S.A., Abd-Shukor, R.
Published: 2018
Online Access:http://dspace.uniten.edu.my/jspui/handle/123456789/9421
id uniten-123456789-9421
recordtype eprints
spelling uniten-123456789-94212018-02-28T23:58:32Z Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes Ewe, L.S. Hamadneh, I. Salama, H. Hamid, N.A. Halim, S.A. Abd-Shukor, R. 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. © 2008 Springer-Verlag. 2018-02-28T23:58:32Z 2018-02-28T23:58:32Z 2009 http://dspace.uniten.edu.my/jspui/handle/123456789/9421
repository_type Digital Repository
institution_category Local University
institution Universiti Tenaga Nasional
building UNITEN Institutional Repository
collection Online Access
description 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. © 2008 Springer-Verlag.
author Ewe, L.S.
Hamadneh, I.
Salama, H.
Hamid, N.A.
Halim, S.A.
Abd-Shukor, R.
spellingShingle Ewe, L.S.
Hamadneh, I.
Salama, H.
Hamid, N.A.
Halim, S.A.
Abd-Shukor, R.
Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes
author_facet Ewe, L.S.
Hamadneh, I.
Salama, H.
Hamid, N.A.
Halim, S.A.
Abd-Shukor, R.
author_sort Ewe, L.S.
title Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes
title_short Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes
title_full Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes
title_fullStr Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes
title_full_unstemmed Magnetotransport properties of La0.67Ca0.33MnO 3 with different grain sizes
title_sort magnetotransport properties of la0.67ca0.33mno 3 with different grain sizes
publishDate 2018
url http://dspace.uniten.edu.my/jspui/handle/123456789/9421
first_indexed 2018-09-05T08:12:37Z
last_indexed 2018-09-05T08:12:37Z
_version_ 1610754458793279488

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