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Crystal growth, transport and magnetic properties of rare-earth manganite $Pr_{1-x}Pb_xMn_{O3}$

Padmanabhan, B and Elizabeth, Suja and Bhat, HL and Rößler, S and Dörr, K and Müller, KH (2006) Crystal growth, transport and magnetic properties of rare-earth manganite $Pr_{1-x}Pb_xMn_{O3}$. 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 $Pr_{1-x}Pb_xMn_{O3}$ (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: 28 May 2008
Last Modified: 13 Oct 2008 06:24
URI: http://eprints.iisc.ernet.in/id/eprint/14071

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