J Mater Sci Technol ›› 2004, Vol. 20 ›› Issue (03): 350-352.

• Research Articles • Previous Articles     Next Articles

The Tb Doping Effect on the Room Temperature Magnetoresistance in (La1-xTbx)0.67Sr0.33MnO3 (x≤ 0.4)

Hongwei QIN, Jifan HU, Juan CHEN, Hongdong NIU, Luming ZHU, Zhuo WANG   

  1. Department of Physics, Shandong University, Jinan 250100, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-05-28 Published:2009-10-10
  • Contact: Hongwei QIN1

Abstract: by Tb in (La1-xTbx)0.67Sr0.33MnO3, the room temperature magnetoresistance △R/R0 drops at first, then undergoes an increase near x≈0.1, and finally drops again. The value of room temperature magnetoresistance at a field H=12 kOe for (La1-xTbx)0.67Sr0.33MnO3 is -3.56%. The enhancement of the room temperature magnetoresistance induced by an appropriate Tb substitution in (La1-xTbx)0.67Sr0.33MnO3 is correlated with the shifts of the Curie temperature and metal-insulator temperature to near room temperature. The drop of the room temperature magnetoresistance at large Tb doping-contents may be due to its lower TC and TMI far from the room temperature.

Key words: Magnetoresistance, (La1-xTbx)0.67Sr0.33MnO3, Curie temperature, Metal-insulator temperature