Effect of Quenching on Magnetoresistance Properties in the Pr0.5Sr0.5MnO3 Perovskite Manganite

• Published in: Journal of solid state chemistry 2002-05, Vol.165 (2), p.375-380
• Main Authors: Boujelben, W., Ellouze, M., Cheikh-Rouhou, A., Pierre, J., Joubert, J.C.
• Format: Article
• Language: English
• Subjects: Colossal magnetoresistance; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Exact sciences and technology; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; magnetoresistance; Magnetotransport phenomena, materials for magnetotransport; manganites; Metal-insulator transitions and other electronic transitions; perovskite; Physics; quenching effect; resistivity
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.2002.9555

We report on the magnetization, resistivity and magnetoresistance (MR) measurements on polycrystalline Pr0.5Sr0.5MnO3. Quenching samples from 1400°C to room temperature in water (sample I) or in air (sample II) leads to different behaviors. Powder X-ray diffraction patterns for samples I and II could be indexed, respectively, in rhombohedral perovskite structure with R3c space group and in the orthorhombic one with Imma space group. Magnetization measurements show that both samples exhibit a paramagnetic–ferromagnetic transition at 280 K (sample I) and 265 K (sample II). At low temperature, sampleI presents a ferromagnetic spin-canted state, while sample II behaves as an antiferromagnet below 160 K. Resistivity and magnetoresistance studies show a net difference as a function of the quenching conditions.