Abstract
Herein, La0.7Ca0.2-xSrxK0.1MnO3 (LCSKMO) films belonging to ABO3 type perovskite on LaAlO3 (100) substrates are successfully fabricated via the facile spin coating method. Moreover, X-ray diffraction and atomic force microscopy are employed to analyze the crystal structure and morphology of LCSKMO films. The distortion of the MnO6 octahedron is confirmed via Fourier transform infrared spectroscopy. Also, the concentration of Mn3+/Mn4+ pairs is assessed using X-ray photoemission spectroscopy. The correlation between microstructure and electrical transport properties is explained through the phenomenological percolation model, double-exchange mechanism, and Jahn–Teller effect. The results reveal that the different Sr-doping content resulted in a decreased resistivity and optimized temperature coefficient of resistivity (TCR) and TCR peak temperature. At the optimized doping molar content of 0.05, the maximum TCR of the resistivity is found to be 10.1% K−1 at 293.4 K.
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This work was supported by the National Natural Science Foundation of China (Grant no. 11674135) and the Analysis and Testing Foundation of Kunming University of Science and Technology (Grant no. 2020M20192230069).
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Guan, X., Li, H., Yu, X. et al. Optimization of temperature coefficient of resistivity of La0.7Ca0.2-xSrxK0.1MnO3 films by Sr at room-temperature. Appl. Phys. A 128, 362 (2022). https://doi.org/10.1007/s00339-022-05490-4
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DOI: https://doi.org/10.1007/s00339-022-05490-4