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Journal of Sol-Gel Science and Technology

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20-03-2019 | Brief Communication: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications

Modulation of room-temperature TCR and MR in La_1−xSr_xMnO₃ polycrystalline ceramics via Sr doping

Authors: Xiaohan Yu, Tao Sun, Qingming Chen, Yunbiao Duan, Xiang Liu

Published in: Journal of Sol-Gel Science and Technology | Issue 2/2019

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Abstract

La_1−xSr_xMnO₃ (LSMO) polycrystalline samples with x content from 0.1 to 0.2 were synthesized via the optimized sol–gel method. The effect of Sr doping (x) on crystal structure, surface morphology, magnetic, and electrical transport properties of LSMO ceramics were investigated systematically. X-ray diffraction (XRD) results showed that all samples crystallized in single phases with rhombohedral structure (R\(\bar 3\)c space group), without any detectable impurity phases. With the increase of x content, lattice parameters expanded, whereas grain size of LSMO ceramic enlarged and grain boundaries (GBs) decreased accordingly. For LSMO ceramics with x = 0.16, peak value of temperature coefficient of resistance (TCR) reached 2.7% K⁻¹ as the peak-TCR temperature (T_K) approached room temperature at 292.5 K, as well as the maximum magnetoresistance (MR) value arrived 17.9% at 300.2 K. In addition, peak TCR of LSMO (x= 0.2) was obtained at 6.4% K⁻¹ as T_K at 329.4 K. These properties of modulation TCR and MR at room temperature in LSMO ceramics were interpreted by the interaction of double exchange mechanism and Jahn-Teller effects.

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Title: Modulation of room-temperature TCR and MR in La1−xSrxMnO3 polycrystalline ceramics via Sr doping
Authors: Xiaohan Yu
Tao Sun
Qingming Chen
Yunbiao Duan
Xiang Liu
Publication date: 20-03-2019
Publisher: Springer US
Published in: Journal of Sol-Gel Science and Technology / Issue 2/2019
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-019-04955-y

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