Crystal growth, transport and magnetic properties of rare-earth manganite Pr1-xPbxMnO3

Padmanabhan, B and Elizabeth, Suja and Bhat, HL and Roessler, S and Doerr, K and Mueller, KH (2006) Crystal growth, transport and magnetic properties of rare-earth manganite Pr1-xPbxMnO3. In: Journal of Magnetism and Magnetic Materials, 307 (2). pp. 288-294.

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Abstract

Crystal growth, electrical and magnetic properties are reported for mixed valence manganite Pr1-xPbxMnO3 (x = 0.2, 0.23, and 0.3). The crystals with x = 0.2 and 0.23 are ferromagnetic and insulating, whereas that with x = 0.3 is ferromagnetic below 200 K and shows an insulator-metal transition at 235 K. This composition shows a magnetoresistance of 90% in a field of 5 T. In the paramagnetic region, the temperature dependence of magnetic susceptibility of the crystals follows a Curie-Weiss behavior. The thermal evolution of magnetization in the ferromagnetic phase varies as T-3/2, in accordance with Bloch's law. The spin-stiffness constant D obtained from the Bloch constant is found to increase linearly with x. The magnetization does not reach complete saturation upto a field of 5 T. A possible contribution of the Pr spins to the total magnetic moment is discussed.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	manganites; magnetization; Curie-Weiss law; Bloch's law
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	03 Aug 2010 05:11
Last Modified:	19 Sep 2010 06:12
URI:	http://eprints.iisc.ernet.in/id/eprint/30889

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