Solid State Science and Technology, Vol. 19, No 1 (2011) 127-131

ISSN 0128-7389

127

MAGNETOTRANSPORT AND ELECTRICAL PROPERTIES OF COLOSSAL

MAGNETORESISTIVE La0.8Sr0.2MnO3 AT DIFFERENT SINTERING

TEMPERATURE

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

 

ABSTRACT

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

electron.

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