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

โœ Scribed by W. Boujelben; M. Ellouze; A. Cheikh-Rouhou; J. Pierre; J.C. Joubert

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
268 KB
Volume
165
Category
Article
ISSN
0022-4596

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โœฆ Synopsis

We report on the magnetization, resistivity and magnetoresistance (MR) measurements on polycrystalline Pr 0.5 Sr 0.5 MnO 3 . Quenching samples from 14003C to room temperature in water (sample I) or in air (sample II) leads to di4erent behaviors. Powder X-ray di4raction patterns for samples I and II could be indexed, respectively, in rhombohedral perovskite structure with R3 c 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, sample I presents a ferromagnetic spin-canted state, while sample II behaves as an antiferromagnet below 160 K. Resistivity and magnetoresistance studies show a net di4erence as a function of the quenching conditions.

2002 Elsevier Science (USA)

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