https://doi.org/10.1140/epjp/s13360-022-03580-z
Regular Article
Structural and electrical properties of gadolinium-substituted La0.6−xGdxSr0.4MnO3 (x = 0–0.3)
Faculty of Physics, Semnan University, PO Box: 35195-363, Semnan, Iran
Received:
27
July
2022
Accepted:
7
December
2022
Published online:
2
January
2023
In recent decades, manganites have received much attention due to their various compositions and applications in various fields. This study investigated manganite’s structural and electrical properties with the chemical formula La0.6−xGdxSr0.4MnO3 (x = 0, 0.25, 0.05, 0.1, and 0.3). All samples were synthesized using the nitrate-complex auto-ignition technique. Structural analysis showed that the crystal structure of these samples is rhombohedral with an R-3c space group at room temperature. The XRD and FESEM image analysis investigated the samples' crystallite and grain size. Measurement of the specific electrical resistance of the samples in the temperature range of 10–350 K and the magnetic fields of 0–9 T showed that the increase in temperature of the electrical resistance first increases and then decreases. All samples’ insulation-metal transition temperature (TM-I) moves to lower temperatures with an increasing Gd3+ substitution and moves to higher temperatures as the magnetic field increases. In addition to increasing substitution, the electrical resistance also increases due to changes in spin irregularity at the grain boundary and, consequently, the difficulty of the double exchange mechanism. The electrical resistance decreases with increasing magnetic field, followed by the magnetic order created in the samples and the changes in the spin angle between the charge carriers. Finally, the bolometric application and magnetoresistivity of the samples are examined.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
