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Electrical and low-field magnetoresistance transport effect of La0.7Ca0.3MnO3: MnO2 composite ceramics

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Abstract

Simultaneously increasing the temperature coefficient of resistivity (TCR) and low-field magnetoresistance (LFMR) has become important. Generally, Mn ions play an important role in the change of electromagnetic properties of the system, and the change of Mn3+/Mn4+ causes the J-T effect and DE interaction. In this paper, (La0.7Ca0.3MnO3)1-x: (MnO2)x(x = 0–0.2) ceramics are prepared by sol-gel and solid-state routine. The morphology, structure, and transport properties are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS), and four-probe technique test methods. The XRD results show that all samples have high crystallinity and density, and the structure (space group) are determined to be Pnma. The SEM grain statistics diagram results show that with the increase of MnO2, the grain size increases and grain boundary decreases. The XPS shows that Mn4+ ions content increases first and then decreases. Moreover, the electrical and magnetic transport properties of the samples are improved, resistivity(ρ), TCR increased from 39.89 to 44.29%·K−1, MR increased from 53.29 to 75.42%, which is larger than most of the other reported values and provides a new direction for the selection of infrared detection materials.

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Highlights

  • (La0.7Ca0.3MnO3)1-x:(MnO2)x(x = 0,0.04,0.08,0.12,0.2) composite were prepared by sol-gel and solid-state routine.

  • By adding MnO2, the structural, electrical and magnetic transport properties of La0.7Ca0.3MnO3 were studied.

  • Both the temperature coefficient of resistance (TCR) and low-field magnetoresistance (LFMR) were greatly enhance.

  • Electrical and magnetic transport properties were investigated and discussed on the basis of the Jahn-Teller (JT) effect and double-exchange (DE) mechanism.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 11564021).

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Authors and Affiliations

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

    Xiangxiang Zhu, Longfei Qi, Haishan Wang, Junfeng Li, Yule Li, Qingming Chen & Hui Zhang

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  1. Xiangxiang Zhu
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Correspondence to Hui Zhang.

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Zhu, X., Qi, L., Wang, H. et al. Electrical and low-field magnetoresistance transport effect of La0.7Ca0.3MnO3: MnO2 composite ceramics. J Sol-Gel Sci Technol 109, 75–85 (2024). https://doi.org/10.1007/s10971-023-06246-z

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