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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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 |
|---|---|
| Publication: | Journal of Magnetism and Magnetic Materials |
| Publisher: | Elsevier |
| 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.ac.in/id/eprint/14071 |
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