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- Title
Electrical transport and magnetoresistive properties of Nd-doped La<sub>0.8</sub>Sr<sub>0.2</sub>MnO<sub>3</sub> ceramics.
- Authors
Wang, Xiaojin; Chen, Qingming; Li, Ling; Wang, Chengyi; Sun, Peng; Zhang, Hui
- Abstract
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 ( R 3 ¯ 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 (ρ–T). 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.
- Subjects
TEMPERATURE coefficient of electric resistance; TRANSITION metals; TRANSITION temperature; ELECTRICAL resistivity; METAL-insulator transitions; MECHANICAL properties of condensed matter; ANNEALING of metals
- Publication
Journal of Materials Science: Materials in Electronics, 2019, Vol 30, Issue 20, p19035
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-019-02261-5