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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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|
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