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Structure, electrical transport and Magneto-Resistance properties of La5/8Ca3/8MnO3 manganite synthesized with different manganese precursors.


Citation

Navasery, Manizheh and Shaari, Abdul Halim and Lim, Kean Pah and Chen, Soo Kien and Roslan, A. S. and Abd Shukor, Roslan (2012) Structure, electrical transport and Magneto-Resistance properties of La5/8Ca3/8MnO3 manganite synthesized with different manganese precursors. Modern Physics Letters B, 26 (6). pp. 1-9. ISSN 0217-9849; ESSN:1793-6640

Abstract

We synthesized the polycrystalline manganite of La5/8Ca3/8MnO3 with three different manganese routes prepared through a solid state reaction method. The effects of the manganese route selection on the structure, electrical transport and magneto-transport properties were examined in this study. The samples were characterized using X-ray diffraction (XRD) and SEM to identify their structure and morphology. XRD analysis confirmed that all samples were in single phase with orthorhombic structure and belonged to the Pnma space group. The average grain sized samples with manganese route of Mn2O3 and MnCO3 had a grain size of 1.2–8.7 μm and 2–7.5 μm, respectively. For the MnO2 route, the sample had a small melt-like shape with higher porosity. The metal–insulator transition temperature, TMI, for LCMO (Mn2O3), LCMO (MnO2) and LCMO (MnCO3) samples were 270 K, 266 K and 258 K, respectively. All the samples showed negative magneto-resistance with significant increase in value near the TMI temperature. The highest CMR (colossal magneto-resistance) ratio was found in LCMO (Mn2O3), -22.06% at 270 K, followed by -16.69% for LCMO (MnO2) at 80 K, and 15.2% for LCMO (MnCO3) at 100 K in a 1 T magnetic field.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1142/S0217984911500394
Publisher: World Scientific Publishing
Keywords: Magneto-resistance; Manganite; Grain boundary; Metal-insulator transition temperature.
Depositing User: Nur Farahin Ramli
Date Deposited: 16 Jul 2013 06:43
Last Modified: 10 Dec 2015 01:50
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1142/S0217984911500394
URI: http://psasir.upm.edu.my/id/eprint/25183
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