Effect of Pr substitution on magnetoresistance in La23/Ba13/MnO3 perovskite

• Main Authors: Shaari, Abdul Halim, A., Huda, Lim, Kean Pah, Lee, Oon Jew, Saion, Elias, Wan Yusoff, Wan Mohd Daud, Cik, Abdulah
• Format: Conference or Workshop Item
• Language: English
• Published: IEEE 2004
• Online Access: http://psasir.upm.edu.my/id/eprint/48201/1/Effect%20of%20Pr%20substitution%20on%20magnetoresistance%20in%20La2.pdf; http://psasir.upm.edu.my/id/eprint/48201/
• Institution: Universiti Putra Malaysia

Polycrystalline of (La1-xPrx)0.67Ba0.33MnO3 with x = 0, 0.167, 0.33, 0.5, 0.67, 0.833, 1 have been prepared using solid state reaction. The effect of substituting praseodymium at La-site on magnetoresistance (MR) effect has been investigated. The electrical property, was determined by using standard four-point probe resistivity measurement in a temperature range of 30 K to 300 K. Metal-insulator transition temperature (Tp) shifted to lower temperatures with the increases of Pr doping with the value of >300, 270, 250, 226, 202, 186 and 158 K for x = 0, 0.167, 0.33, 0.5, 0.67, 0.833, 1, respectively. Overall, MR drops slowly when temperature rises. All doping concentration give small variation range (5% to 25%) except for x=1.0, where this sample show significantly higher MR value at all temperature as compared to other samples. The highest MR value of 38% is observed at 270K. In the semiconducting portion, activation energy (Ea) has been investigated. The Ea increases as the doping concentration increases.