Abstract
The Curie temperature of electron-doped Sr2FeMoO6 can be optimized significantly due to the band-filling effect, but accompanying an almost absent low-field magnetoresistance (LFMR), which is unfavorable to applications in the magnetoresistive devices operated at room temperature. Our previous works confirmed that, a remarkable enhanced LFMR was observed in Sr2FeMoO6 by modifying the grain boundary with insulating organic small molecules (glycerin, CH2OHCHOHCH2OH). However, in this work, modifying the grain boundary strength of the La0.5Sr1.5FeMoO6 with the insulating organic macromolecules (oleic acid, CH3(CH2)7CH=CH(CH2)7COOH) or small molecules (glycerin), both of them have negligible functions on the magnetoresistance (MR) behavior in La0.5Sr1.5FeMoO6. Contrary to the glycerin-modified Sr2FeMoO6, Sr2FeMoO6/oleic acid composites do not exhibit an obviously increased MR property. Based on the above experimental results and the related works, it is proposed that, maintaining high spin polarization of the carriers at the Fermi level and improving the tunneling process across the grain boundary using the suitable organic materials are decisive factors for optimizing the MR behavior in the similar electron-doped double perovskites.
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This work was supported by Fund from the Natural Science Foundation of China (U1504107).
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Li, YF., Liu, Y., Zhang, YM. et al. Effects of organic material on magnetoresistance in electron-doped double perovskite. J Mater Sci: Mater Electron 32, 18711–18720 (2021). https://doi.org/10.1007/s10854-021-06390-8
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DOI: https://doi.org/10.1007/s10854-021-06390-8