Abstract
In this work we investigate the effect of Ag+ doping at Sr2+ site in La0.57Nd0.1Sr0.33−xAgxMnO3 (LNSAMOx, x = 0.00 and 0.15) system on the magnetic and magneto-electrical properties. The variation of the magnetization M versus temperature T, at 0.05 T, reveals a ferromagnetic–paramagnetic transition for all samples. All samples undergo a sharp metal–semiconductor transition at a temperature Tρ, accompanying the ferromagnetic–paramagnetic transition. The maximum values of resistivity temperature coefficient (TCR) and magneto-resistance were 2.5% K−1 and 63% at room temperature of 290 K and 305 K, respectively. The TCR value is considered as an important factor in determining the sensitivity of uncooled infrared bolometers. Most interesting is that the adjustment of the low-temperature range ρ–T revealed the presence of low-temperature peaks in the resistivity curves, attributed to the diffusion effects of grain boundaries, electron–electrons, electron–magnon, electron–phonons and the interactions between them. Overall, LNSAMOx polycrystalline ceramics appear promising for uncooled infrared detectors, magnetic memories or magnetic storage devices.
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Acknowledgements
The authors acknowledge the support of the Tunisian Ministry of Higher Education and Scientific Research within the framework of the Tunisian-Portuguese cooperation in the field of scientific research and technology. This work was supported by national funds from FCT – Fundação para a Ciência e a Tecnologia, I.P., within the project UID/04564/2020. Access to TAIL-UC facility funded under QREN-Mais Centro Project No. ICT_2009_02_012_1890 is gratefully acknowledged.
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Marouani, Y., Gharbi, S., Issaoui, F. et al. Magneto-Transport Properties of the Ag Doping Sr Site in La0.57Nd0.1Sr0.33−xAgxMnO3 (0.00 and 0.15) Manganites. J Low Temp Phys 200, 131–141 (2020). https://doi.org/10.1007/s10909-020-02481-8
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DOI: https://doi.org/10.1007/s10909-020-02481-8