Abstract
Magnetoresistance and temperature coefficient of resistance (TCR) of manganites with ferromagnetism have been reported extensively, but the magnetoresistance and TCR of antiferromagnetic manganites are scarce. The transport properties, TCR, and magnetoresistance effect of antiferromagnetic NdMnO3 have been studied in this work. NdMnO3 samples exhibit semiconductor conductivity, and with the different applied magnetic fields, they still maintain semiconductor characteristics and have considerable stability. Under an applied magnetic field of 6 T, a small negative magnetoresistance of 8% appears near 150 K. Moreover, the conduction mechanism and TCR of NdMnO3 are studied. Three models, thermal activation (TA) model, small polaron (SP) model, and variable range jump (VRH) model, are used to analyze the electrical transport of NdMnO3 samples. The results show that the transport behavior of NdMnO3 samples is more consistent with the TA model. The maximum TCR is 9.4% K−1 within the low temperature region (above liquid nitrogen temperature). The TCR decreases with increasing temperature and it remains 2.5% K−1 near room temperature. Antiferromagnetic NdMnO3 has good TCR performance, which can be applied to temperature sensing field and has good application prospect in antiferromagnetic insulating electronic devices.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. U23A20549, 11604067, U1832143) and the Scientific Research Project of the Department of Education of Zhejiang Province (No. Y202352427). We want to thank colleagues from Bei**g Synchrotron Radiation Facility and Shanghai Synchrotron Radiation Facility for their great support.
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Haochen Wang, Gefei Lu, and Haiou Wang collected the data and written the original draft; Kunpeng Su, Shuai Huang, and Lin Yang participated in the material preparation and the data analysis; Haiou Wang and Weishi Tan were the leaders of the project, guiding experimental design, data collation and analysis, article writing, and revision. All authors read and approved the final manuscript.
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Wang, H., Lu, G., Su, K. et al. Transport properties, magnetoresistance, and temperature coefficient of resistance of perovskite NdMnO3. J Mater Sci: Mater Electron 35, 1097 (2024). https://doi.org/10.1007/s10854-024-12879-9
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DOI: https://doi.org/10.1007/s10854-024-12879-9