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Enhancement of magnetoresistance and near room-temperature temperature coefficient of resistivity in polycrystalline La0.7Ca0.24Na0.06MnO3 by silver doping

  • Original Paper: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications
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Abstract

We reported the synthesis, characterization, electrical transport, and magnetic properties of polycrystalline La0.7Ca0.24Na0.06MnO3:Agy (LCNMO:Agy) with y = 0.0, 0.1, 0.2, 0.3, and 0.4. The combination of EDS and XPS proved that Ag not only entered the perovskite phase structure but there would also be a small amount of Ag enrichment at the grain boundaries. The magnetoresistance (MR) and temperature coefficient of resistivity (TCR) improved significantly with the addition of Ag as a dopant. At y = 0.2, a multi-functional perovskite material with high TCR (30.57% K−1) near room temperature and large MR (72.28%) at the low magnetic field (1 T) was obtained. This enhancement of MR and TCR near room temperature was attributed to the good connectivity between the grains and the decrease in electron scattering at the grain boundaries. Overall, these findings look promising for future applications in infrared detection bolometers.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 11564021) and the Nation Postdoctoral Workstation Foundation Kunming University of Science and Technology (Grant No. 1302/109820200010). The authors gratefully acknowledge the financial support of the High-Level Talent Research Platform Construction Foundation of Kunming University of Science and Technology (Grant No. 1323/141120200023) and the Graduate Foundation of Kunming University of Science and Technology (Grant No. 2020M20192230120).

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Authors and Affiliations

  1. School of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Yunrui Yang, Ling Li, Sheng’an Yang, Fuxin Ling, Yan Gao, Longfei Qi, Dingzhang Wu, Yingjuan Li, Hui Zhang & Qingming Chen

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  1. Yunrui Yang
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  2. Ling Li
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Correspondence to Qingming Chen.

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Yang, Y., Li, L., Yang, S. et al. Enhancement of magnetoresistance and near room-temperature temperature coefficient of resistivity in polycrystalline La0.7Ca0.24Na0.06MnO3 by silver doping. J Sol-Gel Sci Technol 99, 627–635 (2021). https://doi.org/10.1007/s10971-021-05614-x

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