Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites

Since the discovery of colossal magnetoresistance (CMR) effect in the perovskite type of manganites, much research works have been carried out to improve the CMR value by introducing different type of dopant in the system. In this work the effect of rare earth elements Tin (Sn), Bismuth (Bi) and Ind...

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Main Author:	Ali Shaiboub, Ramadan Ebrahim
Format:	Thesis
Language:	English English
Published:	2004
Subjects:	Magnetoresistance. Perovskite.
Online Access:	http://psasir.upm.edu.my/id/eprint/417/1/549713_FSAS_2004_40.pdf
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spelling	my-upm-ir.4172013-05-27T06:48:12Z Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites 2004-04 Ali Shaiboub, Ramadan Ebrahim Since the discovery of colossal magnetoresistance (CMR) effect in the perovskite type of manganites, much research works have been carried out to improve the CMR value by introducing different type of dopant in the system. In this work the effect of rare earth elements Tin (Sn), Bismuth (Bi) and Indium (In) substitution in the La0.67Sr0.33MnO3 system on Mn site had been investigated. The (LSMSnO), (LSMBiO) and (LSMInO), with x=0.00 to x=0.40 ceramic samples were prepared by solid-state reaction technique. The temperature dependence of the magnetic susceptibility, the electrical transport, XRD spectrum of all samples, microstructure and magnetoresistance measurements in the three systems have been studied systematically. With increasing Sn, Bi and In concentration, Tc shifted toward lower temperature, but the lattice constants remain almost unchanged. For higher doping, the spin glass-like state is observed and the system behaves like insulator. These results strongly suggest that the dopant Sn, Bi and In ions weaken the double exchange interaction. The X-ray diffraction patterns indicate that La0.67Sr0.33MnO3 compounds are in single phase with rhombohedra structure. From the ac magnetic susceptibility χ measurements, transitions from paramagnetic (PM) to ferromagnetic (FM) state are observed, indicating the loss of ferromagnetical ordering and consequently weaken the double exchange (DE) mechanism. When the competition between ferromagnetism and antiferromagnetism is strong, spin glass behavior is usually found with freezing temperature for all systems. From the resistance measurements, the metal-to-insulator (M-I) transition occurs at a Tmi. The (M-I) transitions temperature, Tmi shifts towards lower temperature as the Sn, Bi and In content increases and the resistance increases accordingly. The grain size for the dopant concentration of Tin, Bismuth and Indium doped with LSMO system, shows that the grain size essentially decreases with the increase of the dopant amount but remains almost constant size at x>0.12, which indicates that the dissolving amount of the dopant in LSMO may be less when x<0.12. MR values of the three systems are very temperature dependent. The samples exhibit the maximum CMR value at certain temperature. For undoped sample, the maximum MR value observed is 11%. Among these three doped systems, the highest value of CMR with dopant is observed for LSMBiO system with x=0.06 with the value of 45% at 250 K. The colossal magnetoresistive effect of the three systems, appear between 100 K and 250 K. Magnetoresistance. Perovskite. 2004-04 Thesis http://psasir.upm.edu.my/id/eprint/417/ http://psasir.upm.edu.my/id/eprint/417/1/549713_FSAS_2004_40.pdf application/pdf en public masters Universiti Putra Malaysia Magnetoresistance. Perovskite. Faculty of Environmental Studies English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Magnetoresistance. Perovskite.
spellingShingle	Magnetoresistance. Perovskite. Ali Shaiboub, Ramadan Ebrahim Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites
description	Since the discovery of colossal magnetoresistance (CMR) effect in the perovskite type of manganites, much research works have been carried out to improve the CMR value by introducing different type of dopant in the system. In this work the effect of rare earth elements Tin (Sn), Bismuth (Bi) and Indium (In) substitution in the La0.67Sr0.33MnO3 system on Mn site had been investigated. The (LSMSnO), (LSMBiO) and (LSMInO), with x=0.00 to x=0.40 ceramic samples were prepared by solid-state reaction technique. The temperature dependence of the magnetic susceptibility, the electrical transport, XRD spectrum of all samples, microstructure and magnetoresistance measurements in the three systems have been studied systematically. With increasing Sn, Bi and In concentration, Tc shifted toward lower temperature, but the lattice constants remain almost unchanged. For higher doping, the spin glass-like state is observed and the system behaves like insulator. These results strongly suggest that the dopant Sn, Bi and In ions weaken the double exchange interaction. The X-ray diffraction patterns indicate that La0.67Sr0.33MnO3 compounds are in single phase with rhombohedra structure. From the ac magnetic susceptibility χ measurements, transitions from paramagnetic (PM) to ferromagnetic (FM) state are observed, indicating the loss of ferromagnetical ordering and consequently weaken the double exchange (DE) mechanism. When the competition between ferromagnetism and antiferromagnetism is strong, spin glass behavior is usually found with freezing temperature for all systems. From the resistance measurements, the metal-to-insulator (M-I) transition occurs at a Tmi. The (M-I) transitions temperature, Tmi shifts towards lower temperature as the Sn, Bi and In content increases and the resistance increases accordingly. The grain size for the dopant concentration of Tin, Bismuth and Indium doped with LSMO system, shows that the grain size essentially decreases with the increase of the dopant amount but remains almost constant size at x>0.12, which indicates that the dissolving amount of the dopant in LSMO may be less when x<0.12. MR values of the three systems are very temperature dependent. The samples exhibit the maximum CMR value at certain temperature. For undoped sample, the maximum MR value observed is 11%. Among these three doped systems, the highest value of CMR with dopant is observed for LSMBiO system with x=0.06 with the value of 45% at 250 K. The colossal magnetoresistive effect of the three systems, appear between 100 K and 250 K.
format	Thesis
qualification_level	Master's degree
author	Ali Shaiboub, Ramadan Ebrahim
author_facet	Ali Shaiboub, Ramadan Ebrahim
author_sort	Ali Shaiboub, Ramadan Ebrahim
title	Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites
title_short	Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites
title_full	Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites
title_fullStr	Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites
title_full_unstemmed	Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites
title_sort	colossal magnetoresistance effect of lanthanum strontium manganese oxide ceramics doped with tin, bismuth and indium on manganese sites
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Environmental Studies
publishDate	2004
url	http://psasir.upm.edu.my/id/eprint/417/1/549713_FSAS_2004_40.pdf
_version_	1747810216589656064

Colossal Magnetoresistance Effect of Lanthanum Strontium Manganese Oxide Ceramics Doped with Tin, Bismuth and Indium on Manganese Sites

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