2008•AIP conference proceedingsRequires access
Structure, Magnetoresistance and Magnetism of La[sub 0.67](Sr[sub 1−x]Ba[sub x])[sub 0.33]MnO[sub 3] Perovskite
Z. Zalita, S. A. Halim, Kean Pah Lim, O. J. Lee, Claudius Walter, Zainal Abidin Talib, Z. Hishamuddin, H. B. Senin, G. Carini, Jaafar Abdullah, D.A. Bradley
Open publisher page 3 citations
Abstract
The effect of Ba‐substitution at Sr site on the structure, magnetoresistance and magnetic properties of La0.67(Sr1−xBax)0.33MnO3 samples with x = 0.00, 0.25, 0.50, 0.75 and 1.00 has been investigated. Single phase samples were obtained by a conventional solid state reaction method with rhombohedral (x = 0.00) and orthorombic (x = 1.00) structure. The grain size increases with Ba content. Low field magnetoresistance phenomenon at low temperature can be observed for all samples. However it vanishes at 300 K for x = 0.75 and 1.00. The variation of MR% value is small ranging between 16 to 18% at 100 K in an applied field of 1 T. All samples show a single magnetic transition from the ferromagnetic (FM) state to the paramagnetic (PM) state as the temperature increases. Curie temperature, Tc decrease with increasing Ba concentration.