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Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite


Citation

Lim, Kean Pah and Shaari, Abdul Halim and Chen, Soo Kien and Ng, Siau Wei and Zainuddin, Zalita and Ye, Chau Yuen (2009) Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite. Pertanika Journal of Science & Technology, 17 (2). pp. 291-297. ISSN 0128-7680; ESSN: 2231-8526

Abstract / Synopsis

A series of polycrystalline samples (La1-xSmx) 0.67Sr0.33MnO3 (X=0.00, 0.05 and 0.10) were prepared using the conventional solid-state reaction method. The XRD analysis indicated that all the samples were fully crystalline and in a single phase with a rhombohedral structure after a sintering at 1200°C for 24 hours in air. Meanwhile, the Atomic Force Microscopy measurements showed that a small amount of Sm doping in La sites affected the grain growth and this might affect the grain boundary layer, thus resulting in the reduction of the Curie temperature, TC. Extrinsic magnetoresistance (MR) was observed for all the samples with a large negative MR at low field (0-0.1 or 0.2T) region, followed by a slower varying MR at high field (0.1 or 0.2-1T). The highest low-field MR value of -4.6% (at 0.1T) and -6.1% (at 0.2T) were observed for sample X=0.10 and X=0.05, respectively. Hence, these indicated that the extrinsic MR was grain size dependent and was therefore enhanced with a small amount of Sm substitution in La sites.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Universiti Putra Malaysia Press
Keywords: Low-field magnetoresistance; Polycrystalline manganites
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 01 Aug 2015 09:08
Last Modified: 20 Nov 2015 13:52
URI: http://psasir.upm.edu.my/id/eprint/15493
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