Abstract
Based on the analysis of crystal structure, Mn3+/Mn4+ pairs, distortion of MnO6 octahedron, and electrical transport properties of La1-xCaxMnO3 and La1-xSrxMnO3 materials, room-temperature coefficient of resistivity (TCR) of La0.7Ca0.3-xSrxMnO3 (LCSMO) films was optimized by Ca/Sr co-doping at the A-site. LCSMO films are successfully fabricated on LaAlO3 (100) substrates via facile spin coating technology. The microstructure of LCSMO films is characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy and X-ray photoemission spectroscopy. Results reveal that A-site Ca/Sr co-doping significantly influenced crystal structure, formation of Mn3+/Mn4+ pairs, and distortion of MnO6 octahedron. The correlation between microstructure and electrical transport properties was explained through the phenomenological percolation model, double-exchange mechanism and Jahn-Teller effect. Furthermore, the TCR reached 10.2% K-1 at 296.1 K in La0.7Ca0.18Sr0.12MnO3 films.
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