Enhancement of magnetoresistance by strontium deficiency in Pr0.7Sr0.3−xMnO3 manganites

• Published in: Applied physics. A, Materials science & processing Vol. 129; no. 5
• Main Authors: Ben Salem, Ikhlass, Krichene, Akram, Boujelben, Wahiba
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2023; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Condensed Matter Physics; Electrical resistivity; Low temperature; Machines; Magnetic properties; Magnetoresistance; Magnetoresistivity; Manganites; Manufacturing; Materials science; Metal-insulator transition; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Processes; Spintronics; Surfaces and Interfaces; Temperature dependence; Thin Films; Transport properties; Magnetoresistance; Resistivity; Magnetotransport
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-023-06595-0

In this paper, we have studied the electrical and magnetotransport properties of strontium-deficient Pr 0.7 Sr 0.3 −  x MnO 3 polycrystalline manganites prepared by solid-state reaction. The temperature dependence of resistivity shows the presence of a metal–insulator transition at Tρ with the presence of resistivity minimum at very low temperatures. The Tρ values shift from 265 K for x  = 0 to 157 K for x  = 0.1 with increasing strontium deficiency. We have identified the transport mechanisms responsible for magnetotransport properties. Some peculiarities were obtained for x  = 0.1 sample, which can be linked to the half-doped nature of this specimen. Colossal values of magnetoresistance (MR) were recorded for all our samples near Tρ (for µ 0 H  = 2 T, negative MR values are 58%, 89% and 88% for x  = 0, x  = 0.05 and x  = 0.1, respectively). –MR increases with increasing strontium deficiency. Colossal MR values suggests the possibility of using our samples for technological applications like magnetic field sensing and spintronics.