Abstract
La0.8Ba0.2MnO3 (LBMO) films were prepared by spin coating on LaAlO3 substrates with a (00 l) orientation. The effects of pre−sintering temperatures (Tps) on the electrical transport properties of LBMO films were investigated. The combination of microstructure, ionic valence, surface morphology, phenomenological percolation model, and small polaron hopping model revealed that LBMO films exhibited optimized electron−lattice coupling and improved electrical transport properties at higher Tps. In the ferromagnetic metal region, temperature−independent scattering and electron−lattice coupling were suppressed and optimized as the Tps rose, thereby improving the electrical transport properties of LBMO films. In the paramagnetic insulator region, LBMO films exhibited reduced activation energy as the Tps rose, thereby enhancing their delocalization and facilitating polaron hopping to neighboring sites. The provided experimental foundation and conduction mechanisms in different temperature regions were employed to investigate the causes of the improvement process. In sum, the facile control of the electron scattering mechanisms through Tps modulation can provide favorable conditions for application in near room−temperature bolometers.
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