Solid State Science and Technology, Vol. 19, No 1 (2011) 127-131
MAGNETOTRANSPORT AND ELECTRICAL PROPERTIES OF COLOSSAL
MAGNETORESISTIVE La0.8Sr0.2MnO3 AT DIFFERENT SINTERING
S.T. Shilan1,*, L.S. Ewe1, W.N.Voon1 and K.P. Lim2
1College of Engineering, Universiti Tenaga Nasional, Km 7, Jalan Kajang-Puchong,
43009 Kajang, Selangor, Malaysia
2Department of Physics, Faculty of Science, Universiti Putra Malaysia,
43300 UPM Serdang, Selangor, Malaysia
The magnetotransport and electrical properties of La0.8Sr0.2MnO3 (LSMO) compounds
prepared by simple chemical co-precipitation route and sintered at 1120oC, 1220oC and
1320oC were studied. All the samples are indexed in the rhombohedral structure with
R3C space group. From this study, TIM remained nearly constant (~290K) for samples
sintered at 1120oC and 1220oC. Resistivity values were fitted with several equations in
the metallic (ferromagnetic) region. Whereas at insulating (paramagnetic) region,
variable range hopping (VRH) and small polaron hopping (SPH) models were used to
estimate the density of states at Fermi level, N (EF), and activation energy of the
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