Electrical transport and magnetoresistive properties of Nd-doped La0.8Sr0.2MnO3 ceramics

  • Xiaojin Wang
  • Qingming Chen
  • Ling Li
  • Chengyi Wang
  • Peng Sun
  • Hui ZhangEmail author


In this paper, La0.8−xNdxSr0.2MnO3 (x = 0.03, 0.04, 0.05, and 0.06) ceramics were synthesized by a sol–gel method. The structure, surface morphology, electrical transport, and magnetoresistive properties of these materials were studied. X-ray diffraction (XRD) revealed samples to be single-phase with a distorted perovskite structure belonged to the (\({\text{R}}\bar 3{\text{c}}\)) space group. Scanning electron microscopy (SEM) revealed the samples to contain compact grains, with the grain size increasing slightly with the amount of doping Nd3+. The standard four-probe method was used to test the electrical resistivity of the samples as a function of temperature (ρT). The metal–insulator transition temperature (Tp) shifted to lower temperatures and the resistivity (ρ) increased with the content of Nd3+. Peak temperature coefficient of resistance (TCR) and magnetoresistance (MR) were both affected by the Nd3+ substitution. At x = 0.05, peak TCR and MR reached 5.12% K−1 and 19.78%, respectively. The mechanism responsible for both electrical and magnetoresistive properties of these materials was discussed in the frame of double-exchange (DE) interaction.



This work was financially supported by the National Natural Science Foundation of China (Grant No. 11564021), the Analysis and Testing Foundation of Kunming University of Science and Technology, and the Innovation Training Program for College Students (Grant No. 201710674053).


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Authors and Affiliations

  1. 1.Faculty of Materials Science and EngineeringKunming University of Science and TechnologyKunmingChina

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